AL ARISH, EGYPT - NOVEMBER 24:  People gather at the site of the Egypt Sinai mosque bombing in Al-Arish, Egypt on November 24, 2017. The death toll from a bomb that went off outside a mosque in the city of Al-Arish in the northern Sinai Peninsula following Friday prayers has climbed to a whopping 235, according to official sources. At least 109 others were injured in the blast, which occurred in the citys Al-Rawda neighborhood. 
 (Photo by Stringer/Anadolu Agency/Getty Images)
Stringer/Anadolu Agency/Getty Images
AL ARISH, EGYPT - NOVEMBER 24: People gather at the site of the Egypt Sinai mosque bombing in Al-Arish, Egypt on November 24, 2017. The death toll from a bomb that went off outside a mosque in the city of Al-Arish in the northern Sinai Peninsula following Friday prayers has climbed to a whopping 235, according to official sources. At least 109 others were injured in the blast, which occurred in the citys Al-Rawda neighborhood. (Photo by Stringer/Anadolu Agency/Getty Images)
Now playing
01:24
Hundreds killed in Egypt mosque attack
A former US marine allegedly planned to carry out an attack on Pier 39 in San Francisco over the holidays, according to a criminal complaint filed in court in California today.   
 
Everitt Aaron Jameson had supported ISIS on social media and discussed his plans with undercover FBI employees to conduct a San Bernardino or New York style attack, using weapons and explosives, in San Francisco.   A search warrant was executed at his home on Wednesday and authorities found his will, and a letter saying ìlong live Abu Bakr al-Baghdadi,î saying ìyou all have brought this upon yourselves,î and charging ìyouíve allowed Donald Trump to give Al Quds away to the Jews,î in a reference to Jerusalem.   He goes on to say ìWe have penetrated and infiltrated your disgusting country.î   
 
The FBI documents reveal that firearms, empty magazines, ammunition, and fireworks were also found at his Modesto home. 
 
The complaint also says Jameson was discharged from the Marine Corps for ìfraudulent enlistmentî for failing to disclose ìa latent asthma history.î
Everitt Aaron Jameson/Facebook
A former US marine allegedly planned to carry out an attack on Pier 39 in San Francisco over the holidays, according to a criminal complaint filed in court in California today. Everitt Aaron Jameson had supported ISIS on social media and discussed his plans with undercover FBI employees to conduct a San Bernardino or New York style attack, using weapons and explosives, in San Francisco. A search warrant was executed at his home on Wednesday and authorities found his will, and a letter saying ìlong live Abu Bakr al-Baghdadi,î saying ìyou all have brought this upon yourselves,î and charging ìyouíve allowed Donald Trump to give Al Quds away to the Jews,î in a reference to Jerusalem. He goes on to say ìWe have penetrated and infiltrated your disgusting country.î The FBI documents reveal that firearms, empty magazines, ammunition, and fireworks were also found at his Modesto home. The complaint also says Jameson was discharged from the Marine Corps for ìfraudulent enlistmentî for failing to disclose ìa latent asthma history.î
Now playing
01:27
FBI: Former Marine was plotting terror attack
Reuters
Now playing
02:37
How lone wolves get radicalized
Investigators inspect a truck following a shooting incident in New York on October 31, 2017. 
Several people were killed and numerous others injured in New York on Tuesday when a suspect plowed a vehicle into a bike and pedestrian path in Lower Manhattan, and struck another vehicle on Halloween, police said. A suspect exited the vehicle holding up fake guns, before being shot by police and taken into custody, officers said. The motive was not immediately apparent.

 / AFP PHOTO / Don EMMERT        (Photo credit should read DON EMMERT/AFP/Getty Images)
DON EMMERT/AFP/Getty Images
Investigators inspect a truck following a shooting incident in New York on October 31, 2017. Several people were killed and numerous others injured in New York on Tuesday when a suspect plowed a vehicle into a bike and pedestrian path in Lower Manhattan, and struck another vehicle on Halloween, police said. A suspect exited the vehicle holding up fake guns, before being shot by police and taken into custody, officers said. The motive was not immediately apparent. / AFP PHOTO / Don EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)
Now playing
01:43
The vulnerability of 'soft targets' to terror
LAS VEGAS, NV - OCTOBER 02:  An ambulance leaves the intersection of Las Vegas Boulevard and Tropicana Ave. after a mass shooting at a country music festival nearby on October 2, 2017 in Las Vegas, Nevada. A gunman has opened fire on a music festival in Las Vegas, leaving at least 20 people dead and more than 100 injured. Police have confirmed that one suspect has been shot. The investigation is ongoing. (Photo by Ethan Miller/Getty Images)
Ethan Miller/Getty Images
LAS VEGAS, NV - OCTOBER 02: An ambulance leaves the intersection of Las Vegas Boulevard and Tropicana Ave. after a mass shooting at a country music festival nearby on October 2, 2017 in Las Vegas, Nevada. A gunman has opened fire on a music festival in Las Vegas, leaving at least 20 people dead and more than 100 injured. Police have confirmed that one suspect has been shot. The investigation is ongoing. (Photo by Ethan Miller/Getty Images)
Now playing
02:46
Is it an act of violence or terror?
Firefighters arrived on Eighth Avenue near the scene of a reported explosion on Monday morning in Manhattan, New York, December 11, 2017. (David Scull/The New York Times)
David Scull/The New York Times/redux pictures
Firefighters arrived on Eighth Avenue near the scene of a reported explosion on Monday morning in Manhattan, New York, December 11, 2017. (David Scull/The New York Times)
Now playing
01:41
Latest on NYC terrorism investigation
Italian police and forensics experts gather around the body of suspected Berlin truck attacker Anis Amri after he was shot dead in Milan on December 23, 2016.  
The Tunisian man suspected of carrying out the deadly Berlin truck attack at the Christmas market was shot dead by police in Milan on December 23, Italy's interior minister Marco Minniti said. The minister told a press conference in Rome that Anis Amri had been fatally shot after firing at two police officers who had stopped his car for a routine identity check around 3:00 am (0200 GMT). Identity checks had established "without a shadow of doubt" that the dead man was Amri, the minister said. / AFP / DANIELE BENNATI        (Photo credit should read DANIELE BENNATI/AFP/Getty Images)
DANIELE BENNATI/AFP/AFP/Getty Images
Italian police and forensics experts gather around the body of suspected Berlin truck attacker Anis Amri after he was shot dead in Milan on December 23, 2016. The Tunisian man suspected of carrying out the deadly Berlin truck attack at the Christmas market was shot dead by police in Milan on December 23, Italy's interior minister Marco Minniti said. The minister told a press conference in Rome that Anis Amri had been fatally shot after firing at two police officers who had stopped his car for a routine identity check around 3:00 am (0200 GMT). Identity checks had established "without a shadow of doubt" that the dead man was Amri, the minister said. / AFP / DANIELE BENNATI (Photo credit should read DANIELE BENNATI/AFP/Getty Images)
Now playing
01:10
How the Berlin attack unfolded
Americans killed in Nice
Brodie and Sean Copeland, the Americans killed in Nice, were in Nice to celebrate a birthday with the rest of their family, Sean's niece Haley Copeland posted to social media. 
Another niece, Heather Copeland, asked for prayers on social media for her family. 
Approved to report by Row's Anissa Wells. 
Heather Copeland tweeted: "I don't even know how to put this in words. Today was a very tradgic day for my family. My Uncle Sean and my cousin Brodie Copeland were killed today in a teriorist attack in Nice France while they were on vacation. A huge box truck ran over and killed 80 plus people and injured over 100. Please keep my family and all the other family's affected by the tragic event that occurred tonight in your prayers. #PrayForNice #PrayersForFrance"
Haley Copeland tweeted her Facebook post: "By now many of you have heard about the 80 people that have died in nice, France today from a terrorist attack driving through a parade. 2 of those 80 people were American and those 2 people happen to be Uncle Sean and 11 year old cousin Brodie. They were there on vacation with my two other cousins and aunt celebrating a birthday. This is an extremely difficult time for my family and anyone who knows Sean and Brodie Copeland. Losing a love one is hard no matter the circumstances but losing a loved one in such a tragic and unexpected way in unbearable. Prayers are much appreciated. #CopelandFamily #nice"
From Twitter
Americans killed in Nice Brodie and Sean Copeland, the Americans killed in Nice, were in Nice to celebrate a birthday with the rest of their family, Sean's niece Haley Copeland posted to social media. Another niece, Heather Copeland, asked for prayers on social media for her family. Approved to report by Row's Anissa Wells. Heather Copeland tweeted: "I don't even know how to put this in words. Today was a very tradgic day for my family. My Uncle Sean and my cousin Brodie Copeland were killed today in a teriorist attack in Nice France while they were on vacation. A huge box truck ran over and killed 80 plus people and injured over 100. Please keep my family and all the other family's affected by the tragic event that occurred tonight in your prayers. #PrayForNice #PrayersForFrance" Haley Copeland tweeted her Facebook post: "By now many of you have heard about the 80 people that have died in nice, France today from a terrorist attack driving through a parade. 2 of those 80 people were American and those 2 people happen to be Uncle Sean and 11 year old cousin Brodie. They were there on vacation with my two other cousins and aunt celebrating a birthday. This is an extremely difficult time for my family and anyone who knows Sean and Brodie Copeland. Losing a love one is hard no matter the circumstances but losing a loved one in such a tragic and unexpected way in unbearable. Prayers are much appreciated. #CopelandFamily #nice"
Now playing
01:12
Texas father and son killed in Nice, France
Passengers walk in Terminal 3 at O'Hare airport in Chicago, Tuesday, Nov. 21, 2017. Officials with the Illinois Department of Transportation and Illinois State Police say the ramped up enforcement efforts involving more than 150 law enforcement agencies will end early Monday. (AP Photo/Nam Y. Huh)
Nam Y. Huh/AP
Passengers walk in Terminal 3 at O'Hare airport in Chicago, Tuesday, Nov. 21, 2017. Officials with the Illinois Department of Transportation and Illinois State Police say the ramped up enforcement efforts involving more than 150 law enforcement agencies will end early Monday. (AP Photo/Nam Y. Huh)
Now playing
02:15
US intelligence fears holiday terror attack
Family Photo/Facebook/AP
Now playing
02:16
Details of NYC terror attack emerge
US President Donald Trump (R) and Russia's President Vladimir Putin talk as they make their way to take the "family photo" during the Asia-Pacific Economic Cooperation (APEC) leaders' summit in the central Vietnamese city of Danang on November 11, 2017.
World leaders and senior business figures are gathering in the Vietnamese city of Danang this week for the annual 21-member APEC summit. / AFP PHOTO / POOL / JORGE SILVA        (Photo credit should read JORGE SILVA/AFP/Getty Images)
JORGE SILVA/AFP/Getty Images
US President Donald Trump (R) and Russia's President Vladimir Putin talk as they make their way to take the "family photo" during the Asia-Pacific Economic Cooperation (APEC) leaders' summit in the central Vietnamese city of Danang on November 11, 2017. World leaders and senior business figures are gathering in the Vietnamese city of Danang this week for the annual 21-member APEC summit. / AFP PHOTO / POOL / JORGE SILVA (Photo credit should read JORGE SILVA/AFP/Getty Images)
Now playing
02:36
Putin thanks Trump for tip on terror attack
Nidhi Chaphekar, right, a 40-year-old Jet Airways flight attendant from Mumbai, and another unidentified woman after being wounded in Brussels Airport in Brussels, Belgium, after explosions were heard. The Indian flight attendant who was injured in the Brussels airport blasts is in stable condition and recovering, her airline Jet Airways said Friday, March 25, 2016. Chaphekar suffered burns and fractured her foot in the explosions on Tuesday. She has been treated at a hospital near Brussels.
Ketevan Kardava/AP
Nidhi Chaphekar, right, a 40-year-old Jet Airways flight attendant from Mumbai, and another unidentified woman after being wounded in Brussels Airport in Brussels, Belgium, after explosions were heard. The Indian flight attendant who was injured in the Brussels airport blasts is in stable condition and recovering, her airline Jet Airways said Friday, March 25, 2016. Chaphekar suffered burns and fractured her foot in the explosions on Tuesday. She has been treated at a hospital near Brussels.
Now playing
01:45
Video timeline: They saw the Brussels attacks
Mexican police agents patrol near a nightclub in Playa del Carmen, Quintana Ro state, Mexico where 5 people were killed, three of them foreigners, during a music festival on January 16, 2017.
A shooting erupted at an electronic music festival in the Mexican resort of Playa del Carmen early Monday, leaving at least five people dead and sparking a stampede, the mayor said. Fifteen people were injured, some in the stampede, after at least one shooter opened fire before dawn at the Blue Parrot nightclub during the BPM festival.


 / AFP PHOTO / STRSTR/AFP/Getty Images
AFP/Getty Images
Mexican police agents patrol near a nightclub in Playa del Carmen, Quintana Ro state, Mexico where 5 people were killed, three of them foreigners, during a music festival on January 16, 2017. A shooting erupted at an electronic music festival in the Mexican resort of Playa del Carmen early Monday, leaving at least five people dead and sparking a stampede, the mayor said. Fifteen people were injured, some in the stampede, after at least one shooter opened fire before dawn at the Blue Parrot nightclub during the BPM festival. / AFP PHOTO / STRSTR/AFP/Getty Images
Now playing
02:18
What we know about Mexico club shooting

If you have photos or video from the attack, you can share them with CNN via WhatsApp at +1 347 322 0415. Please do not put yourself in danger.

(CNN) —  

The death toll in a bomb and gun attack on a Sufi mosque in northern Sinai has risen to 305, with 27 children among the dead, Egypt’s state prosecutor said Saturday.

Another 128 people were wounded, according to a statement from the public prosecutor read out on Egyptian state-run news channel Nile TV.

Between 25 and 30 armed men carried out the assault on the al Rawdah Sufi mosque in Bir al-Abed, the statement said.

The prosecutor also gave more detail about how the brutal attack unfolded. The attackers arrived in five SUVs and were armed with automatic machine guns, the statement said. They took position in front of the mosque and its entrances.

Survivors of the incident now at the hospital described massive gunfire and loud explosions at the start of the attack. A number of attackers, some of them masked, then entered the mosque, the statement said.

The attackers had long beards and hair, were wearing military fatigues and were armed with heavy machine guns, according to the statement. At least one of those who entered the mosque was carrying an ISIS flag, it said.

There has not yet been a claim of responsibility from ISIS or its affiliate in Egypt. However, the attack bears the hallmarks of a strike by ISIS, which maintains a foothold in the north of the Sinai Peninsula and inspires local Islamist extremist groups, despite the efforts of Egyptian security forces.

Victims are seen on the floor of al Rawdah mosque following the gun and bomb attack Friday.
STRINGER/AFP/Getty Images
Victims are seen on the floor of al Rawdah mosque following the gun and bomb attack Friday.

President vows ‘brute force’

President Abdel Fattah el-Sisi vowed to respond to the massacre – believed to be the deadliest terrorist attack on the country’s soil – with “brute force.”

Egyptian warplanes conducted airstrikes on “terrorist outposts” and vehicles following the attack, the military said Saturday.

“The Egyptian Air Force pursued the terrorist elements, discovered and destroyed a number of vehicles that carried out the brutal terrorist killings, and killed all terrorists inside those vehicles,” military spokesman Tamer Rifai said in a statement Saturday.

It also targeted a number of terrorist outposts containing weapons, ammunition and radical elements, Rifai said.

A teenage survivor of the attack is treated Friday at a hospital in Ismailia.
Amr Nabil/AP
A teenage survivor of the attack is treated Friday at a hospital in Ismailia.

Al Rawdah mosque is known as the birthplace of an important Sufi cleric. Sufism is a mystical branch of Islam that some jihadists consider heretical.

Witnesses told CNN that the attack started when an explosive device went off in a building adjacent to the mosque and that gunmen fired at worshippers as they fled. Gunmen then entered the mosque and fired at those inside, they said.

The attackers had also set up “ambush” locations and opened fire on ambulances as they transported the wounded to al-Arish before the arrival of security services, according to witnesses.

Photos from inside the mosque showed what appeared to be bodies lined up in rows on the carpet.

’No one got out of the mosque’

One survivor, who asked that his name not be used, told CNN on Saturday that he still had shrapnel in an eye that was covered by a bandage. Sitting with tribesmen outside a hospital emergency room, he said he believes he survived because he was covered by the bodies of other victims as the attackers went around the mosque to ensure everyone was dead.

“No one got out of the mosque,” said another witness at a nearby hospital. The man, who also declined to be identified out of fear of retaliation, said his father and eight other family members, including a brother and nephew, were killed.

The man said soldiers from a nearby military unit must have heard the gunfire during the attack but did not immediately respond.

“Even the ambulances came under fire.” he said.

A man nearby nodded in agreement. Moments later, hospital volunteers alerted a military officer protecting the hospital – who asked reporters to leave.

Another man told CNN he drove one of the first ambulances to the scene but turned around after shots were fired at the vehicle. Ambulances from al-Arish managed to reach the mosque only after security forces secured the road, he said.

The attackers used automatic weapons, said Diaa Rashwan, the chairman of the state information service. Some victims were also killed by the explosions.

National mourning declared

In a short, televised speech after meeting with security officials, Sisi said the government would hunt down the attackers.

“We will respond to this act with brute force against these terrorists,” he said. “This terrorist act will strengthen our resolve, steadfastness and will to stand up to, resist and battle against terrorism.”

President Abdel Fattah el-Sisi, center, meets with officials in Cairo after the mosque attack.
HANDOUT/Egyptian Presidency via AP
President Abdel Fattah el-Sisi, center, meets with officials in Cairo after the mosque attack.

Three days of national mourning have been declared. Sisi has also ordered the armed forces to build a memorial to those killed at the mosque, a statement on his official Facebook page said.

The grand imam of Al-Azhar, the premier religious authority in Egypt, condemned the “barbaric attack” on the mosque.

“The shedding of blood, the violation of the sacred houses of God and the terrorizing of worshippers are acts of corruption on the earth,” Ahmed El-Tayyeb said.

The targeting of mosques followed an attack on churches, El-Tayyeb said, adding that Egyptians would prevail over terrorism with solidarity and determination.

People gather at the site of the mosque attack on Friday.
Stringer/Anadolu Agency/Getty Images
People gather at the site of the mosque attack on Friday.

Northern Sinai unrest

Friday’s attack prompted wide international condemnation, with US President Donald Trump among the leaders expressing condolences and vowing to continue the fight against terrorism.

Sisi expressed concern recently that ISIS militants fleeing Iraq and Syria would come to Egypt.

Egyptian security forces face almost daily attacks from militants with ISIS ties in northern Sinai.

The Wilayat Sinai group, which pledged allegiance to ISIS in 2014, has been behind numerous attacks and hundreds of deaths in the desert region.

It claimed responsibility for the bombing of a Russian passenger jet that crashed in October 2015 in the Sinai Peninsula, killing 224 people.

Relatives of the victims of the mosque attack sit outside a hospital Saturday in the eastern port city of Ismailia.
MOHAMED EL-SHAHED/AFP/Getty Images
Relatives of the victims of the mosque attack sit outside a hospital Saturday in the eastern port city of Ismailia.

If it turns out ISIS militants are behind the latest attack, “it reflects their willingness to continue to do large operations that have large civilian casualties,” Timothy Kaldas, a non-resident fellow at the Tahrir Institute for Middle East Policy, told CNN.

There would be two plausible motives for an ISIS attack, he said. First, ISIS considers Sufis to be heretics, making the Sufi mosque a legitimate target in the eyes of ISIS, even though all worshippers probably weren’t Sufi.

Second, Kaldas said, ISIS may be taking revenge against members of the Sawarkah tribe, to which most of the people in the area belong, because it has been cooperating with the Egyptian government in its campaign against Wilayat Sinai.

CNN’s Ray Sanchez, Ian Lee, Abeer Salman, Tamara Qiblawi, Hilary McGann, Saskya Vandoorne, Schams Elwazer and Sarah El Sirgany contributed to this report.