Mandatory Credit: Photo by MCPIX/REX/Shutterstock (8828094h)
The scene outside the Manchester Arena where serious incident has taken place.
Explosion at Manchester Arena, UK - 22 May 2017
MCPIX/REX/Shutterstock
Mandatory Credit: Photo by MCPIX/REX/Shutterstock (8828094h) The scene outside the Manchester Arena where serious incident has taken place. Explosion at Manchester Arena, UK - 22 May 2017
Now playing
01:37
New Manchester photos show detonator
Indianapolis shooting victims family 04172021
CNN
Indianapolis shooting victims family 04172021
Now playing
03:22
'Completely devastating': Family of Indianapolis shooting victims speak out
WINDSOR, ENGLAND - APRIL 17: The Duke of Edinburgh's coffin, covered with His Royal Highness's Personal Standard is carried to the purpose built Land Rover during the funeral of Prince Philip, Duke of Edinburgh at Windsor Castle on April 17, 2021 in Windsor, England. Prince Philip of Greece and Denmark was born 10 June 1921, in Greece. He served in the British Royal Navy and fought in WWII. He married the then Princess Elizabeth on 20 November 1947 and was created Duke of Edinburgh, Earl of Merioneth, and Baron Greenwich by King VI. He served as Prince Consort to Queen Elizabeth II until his death on April 9 2021, months short of his 100th birthday. His funeral takes place today at Windsor Castle with only 30 guests invited due to Coronavirus pandemic restrictions. (Photo by Adrian Dennis/WPA Pool/Getty Images)
Adrian Dennis/WPA Pool/Getty Images
WINDSOR, ENGLAND - APRIL 17: The Duke of Edinburgh's coffin, covered with His Royal Highness's Personal Standard is carried to the purpose built Land Rover during the funeral of Prince Philip, Duke of Edinburgh at Windsor Castle on April 17, 2021 in Windsor, England. Prince Philip of Greece and Denmark was born 10 June 1921, in Greece. He served in the British Royal Navy and fought in WWII. He married the then Princess Elizabeth on 20 November 1947 and was created Duke of Edinburgh, Earl of Merioneth, and Baron Greenwich by King VI. He served as Prince Consort to Queen Elizabeth II until his death on April 9 2021, months short of his 100th birthday. His funeral takes place today at Windsor Castle with only 30 guests invited due to Coronavirus pandemic restrictions. (Photo by Adrian Dennis/WPA Pool/Getty Images)
Now playing
02:29
See memorable moments from Prince Philip's funeral
Russian opposition leader Alexei Navalny delivers a speech during a demonstration in Moscow on September 29, 2019. - Thousands gathered in Moscow for a demonstration demanding the release of the opposition protesters prosecuted in recent months. Police estimated a turnout of 20,000 people at the Sakharov Avenue in central Moscow about half an hour after the start of the protest, which was authorised. The demonstrators chanted "let them go" and brandished placards demanding a halt to "repressions" of opposition protesters. (Photo by Yuri KADOBNOV / AFP) (Photo by YURI KADOBNOV/AFP via Getty Images)
YURI KADOBNOV/AFP/Getty Images
Russian opposition leader Alexei Navalny delivers a speech during a demonstration in Moscow on September 29, 2019. - Thousands gathered in Moscow for a demonstration demanding the release of the opposition protesters prosecuted in recent months. Police estimated a turnout of 20,000 people at the Sakharov Avenue in central Moscow about half an hour after the start of the protest, which was authorised. The demonstrators chanted "let them go" and brandished placards demanding a halt to "repressions" of opposition protesters. (Photo by Yuri KADOBNOV / AFP) (Photo by YURI KADOBNOV/AFP via Getty Images)
Now playing
02:09
Alexey Navalny 'close to death,' press secretary says
Rep. Marjorie Taylor Greene (R-GA) speaks during a press conference outside the U.S. Capitol on February 5, 2021 in Washington, DC. The House voted 230 to 199 on Friday evening to remove Rep. Marjorie Taylor Greene (R-GA) from committee assignments over her remarks about QAnon and other conspiracy theories.
Drew Angerer/Getty Images
Rep. Marjorie Taylor Greene (R-GA) speaks during a press conference outside the U.S. Capitol on February 5, 2021 in Washington, DC. The House voted 230 to 199 on Friday evening to remove Rep. Marjorie Taylor Greene (R-GA) from committee assignments over her remarks about QAnon and other conspiracy theories.
Now playing
03:20
Marjorie Taylor Greene lashes out at media after backlash over controversial caucus
Getty Images
Now playing
03:00
The end of an era has arrived in Cuba
WISH
Now playing
02:26
Police identify FedEx facility gunman as former employee
Biden speaks from the Treaty Room in the White House on April 14, 2021 in Washington, DC.
Andrew Harnik/Pool/Getty Images
Biden speaks from the Treaty Room in the White House on April 14, 2021 in Washington, DC.
Now playing
02:44
'National embarrassment': Biden reacts to mass shootings
Two military aircraft fly over the White House on April 16, 2021 in Washington, DC. The US Air Force F-22 fighter aircraft flew over Washington as part of the World War I memorial dedication ceremony.
Chip Somodevilla/Getty Images
Two military aircraft fly over the White House on April 16, 2021 in Washington, DC. The US Air Force F-22 fighter aircraft flew over Washington as part of the World War I memorial dedication ceremony.
Now playing
00:52
Watch military flyover interrupt a White House briefing
Shadae McCallum
Now playing
02:30
Soldier arrested after video shows him pushing a Black man
MOSCOW, RUSSIA - APRIL 15:  Russian President Vladimir Putin (L) talks to talks to Foreign Minister Sergey Lavrov during a meeting with Uzbekistan President Islam Karimov in the Kremlin on April 15, 2013 in in Moscow, Russia. Karimov is on a state visit to Russia. (Photo by Sasha Mordovets/Getty Images)
Sasha Mordovets/Getty Images
MOSCOW, RUSSIA - APRIL 15: Russian President Vladimir Putin (L) talks to talks to Foreign Minister Sergey Lavrov during a meeting with Uzbekistan President Islam Karimov in the Kremlin on April 15, 2013 in in Moscow, Russia. Karimov is on a state visit to Russia. (Photo by Sasha Mordovets/Getty Images)
Now playing
02:07
Russia to expel 10 US diplomats in 'tit-for-tat response' to Biden sanctions
WASHINGTON, DC - JUNE 13: Rep. Michelle Lujan Grisham (D-NM) speaks during a news conference on immigration to condemn the Trump Administration's "zero tolerance" immigration policy, outside the US Capitol on June 13, 2018 in Washington, DC. (Photo by Toya Sarno Jordan/Getty Images)
Toya Sarno Jordan/Getty Images
WASHINGTON, DC - JUNE 13: Rep. Michelle Lujan Grisham (D-NM) speaks during a news conference on immigration to condemn the Trump Administration's "zero tolerance" immigration policy, outside the US Capitol on June 13, 2018 in Washington, DC. (Photo by Toya Sarno Jordan/Getty Images)
Now playing
02:39
Governor settles with former campaign staffer who accused her of sexual mistreatment
Former Minneapolis Police officer Derek Chauvin chooses not to testify at his trial on April 15. Sitting to his left is defense attorney Eric Nelson.
Pool
Former Minneapolis Police officer Derek Chauvin chooses not to testify at his trial on April 15. Sitting to his left is defense attorney Eric Nelson.
Now playing
02:10
Derek Chauvin invokes 5th Amendment right at trial
Rep. Matt Gaetz, R-Fla., questions witnesses during a House Armed Services Committee hearing on Capitol Hill, Wednesday, April 14, 2021, in Washington.
Manuel Balce Ceneta/AP
Rep. Matt Gaetz, R-Fla., questions witnesses during a House Armed Services Committee hearing on Capitol Hill, Wednesday, April 14, 2021, in Washington.
Now playing
02:59
Women detail late-night parties with Gaetz
Pool
Now playing
06:07
Fauci fires back at Rep. Jim Jordan during heated exchange
President Joe Biden arrives to speak from the Treaty Room in the White House on Wednesday, April 14, 2021, about the withdrawal of the remainder of U.S. troops from Afghanistan.
Andrew Harnik/Pool/AP
President Joe Biden arrives to speak from the Treaty Room in the White House on Wednesday, April 14, 2021, about the withdrawal of the remainder of U.S. troops from Afghanistan.
Now playing
02:44
See Biden make historic announcement on US troops in Afghanistan
Avril Haines
POOL
Avril Haines
Now playing
01:09
DNI director gives two primary theories of where Covid-19 transmitted initially

Story highlights

UK says it will resume intelligence sharing with US

A cordon was temporarily set up in Wigan after discovery of "potentially suspicious items," police say

(CNN) —  

Manchester suicide bomber Salman Abedi likely received some ISIS training in Syria in the months before the attack, according to information gathered in the preliminary investigation, a US official told CNN on Thursday.

The US believes ISIS, through that training, set the stage for the 22-year old to carry out the deadly attack at the Manchester Arena on Monday night, which killed 22 people as they left a pop concert.

Other members of Abedi’s family are believed to have been radicalized as well, the official said.

More details are emerging about the British-born killer, who spent time in Libya before the attack and transited through Istanbul and Dusseldorf airports, as police focus on tracking down his associates.

Authorities have made multiple arrests including the bomber’s brother, who was detained in Libya.

02:38 - Source: CNN
UK angry over Manchester attack leaks

The latest revelations come as intelligence sharing between the US and the UK resumed after a temporary halt following a series of high-profile leaks to US media of details surrounding the Manchester bombing investigation, which were blamed on US government officials.

Mark Rowley, assistant commissioner of Britain National Police Chiefs Council, said after receiving “fresh assurances,” the UK was now “working closely” its key partners, “including all those in the ’Five Eyes’ intelligence alliance.”

US-UK tensions

Under ‘Five Eyes,’ the US, UK, Canada, Australia and New Zealand share intelligence in one of the world’s tightest multilateral arrangements.

US sources were the first to reveal the identity of the bomber, leading to concern that police efforts to hunt down his associates could be impacted.

British Prime Minister Theresa May confronted President Donald Trump about the leaks during their meeting at the NATO headquarters in Brussels on Thursday.

In a written statement, President Trump described the leaks as “deeply troubling” and ordered an investigation. He added that,”There is no relationship we cherish more than the special relationship between the United States and the United Kingdom.”

US Secretary of State Rex Tillerson will press the point during his first official visit to the UK on Friday.

Tillerson will meet with British Foreign Secretary Boris Johnson “in an expression of UK-US solidarity following the terrorist attack in Manchester earlier this week,” a Foreign Office statement said. The two men will write condolence messages for the victims.

00:52 - Source: CNN
Queen Elizabeth II visits attack victims

‘Significant’ arrests

Greater Manchester Police Chief Constable Ian Hopkins told reporters Thursday eight men had been arrested at addresses in Manchester, Wigan and Nuneaton. These arrests are “significant,” he said, with searches having “revealed items that we believe are very important to the investigation.”

On Thursday, a large cordon was set up for a time around a location in Wigan, where an arrest was made a day earlier, Greater Manchester Police said in a statement.

A raid and search have been ongoing due to the discovery of “potentially suspicious items” and evacuations took place as a “matter of precaution.”

Investigators are tracking down associates of Abedi, a British-born national of Libyan descent who was known to intelligence services, saying it is clear they are investigating a network.

A Turkish official said Abedi had transited through Istanbul’s Ataturk airport “recently” and did not enter Turkey. The official, who did not want to be named due to government protocol, said he could not confirm where Abedi arrived from or was traveling to. He did say, however, that it could not have been Syria because there are no flights to or from Syria from Istanbul.

The official said Turkey had not received any information from foreign intelligence services about Abedi, so he did not raise any red flags.

Police in Dusseldorf confirmed that Abedi traveled through Dusseldorf Airport in Germany on his way to Manchester a few days before the attack. The suspect was in transit only in the security area.

Abedi ‘behaved like a child’

According to a family friend who asked not to be identified, the boys’ father had taken his sons to Libya in mid-April and confiscated their passports so they couldn’t return to the UK where they’d been in trouble with gangs.

Abedi got his passport back after telling his father he was going on a pilgrimage to Saudi Arabia, but returned to England instead. Abedi was in Libya for three weeks and returned days before his attack, US military officials told CNN.

Hashim Ramadan Abu Qassem al-Abedi, a brother of Manchester bomber Salman Abedi was arrested in Tripoli, Libya, May 23.