title: File uploaded by user duration: 00:00:00 site:  author:  published:  intervention: no description:
title: File uploaded by user duration: 00:00:00 site: author: published: intervention: no description:
Now playing
02:00
Four killed in suicide bombing
istanbul bombing Lila pkg_00003617.jpg
istanbul bombing Lila pkg_00003617.jpg
Now playing
01:49
Turkey's president vows revenge after attack
title:   duration: 00:00:00  site:   author:   published:   intervention: yes  description:     Gaziantep, Turkey
Anadolu Agency
title: duration: 00:00:00 site: author: published: intervention: yes description: Gaziantep, Turkey
Now playing
01:05
Video shows explosion rock wedding party
Turkish security officials work at the explosion site after a bus was struck by a bomb in Istanbul, Tuesday, June 7, 2016.
AP
Turkish security officials work at the explosion site after a bus was struck by a bomb in Istanbul, Tuesday, June 7, 2016.
Now playing
02:51
Police bus targeted in Istanbul bombing
baghdad deadly explosions lklv damon wrn_00011509.jpg
baghdad deadly explosions lklv damon wrn_00011509.jpg
Now playing
01:54
Almost 100 killed in series of Baghdad attacks
car bombing kills 11 in istanbul_00000204.jpg
car bombing kills 11 in istanbul_00000204.jpg
Now playing
01:49
Car bombing kills 11 in Istanbul
car bomb terror attack turkey arwa damon lead live_00004313.jpg
car bomb terror attack turkey arwa damon lead live_00004313.jpg
Now playing
02:23
11 suspects in custody in connection with Turkey terror attack
Rescuers carry a victim on a stretcher at the scene of a blast in Ankara on March 13, 2016.
At least 27 people were killed and 75 others wounded in a blast in the heart of the Turkish capital Ankara, local media reported, speaking of an attack. Ambulances rushed to the scene of the explosion on Kizilay square, a key hub in the city, and television pictures showed burnt-out vehicles including a bus.
 / AFP / ADEM ALTAN        (Photo credit should read ADEM ALTAN/AFP/Getty Images)
ADEM ALTAN/AFP/Getty Images
Rescuers carry a victim on a stretcher at the scene of a blast in Ankara on March 13, 2016. At least 27 people were killed and 75 others wounded in a blast in the heart of the Turkish capital Ankara, local media reported, speaking of an attack. Ambulances rushed to the scene of the explosion on Kizilay square, a key hub in the city, and television pictures showed burnt-out vehicles including a bus. / AFP / ADEM ALTAN (Photo credit should read ADEM ALTAN/AFP/Getty Images)
Now playing
03:16
After Ankara attack, will Erdogan escalate conflict?
ANKARA, TURKEY - FEBRUARY 17: Smoke billows from the blast site as Turkish army service busses burn after an explosion on February 17, 2016 in Ankara, Turkey. 21 people are believed to have been killed and at least 61 are said to be wounded according to the city's governor Mehmet Kiliclar in what appeared to have been a car bomb attack on a vehicle carrying military personnel in the Turkish capital. (Photo by Defne Karadeniz/Getty Images)
Defne Karadeniz/Getty Images
ANKARA, TURKEY - FEBRUARY 17: Smoke billows from the blast site as Turkish army service busses burn after an explosion on February 17, 2016 in Ankara, Turkey. 21 people are believed to have been killed and at least 61 are said to be wounded according to the city's governor Mehmet Kiliclar in what appeared to have been a car bomb attack on a vehicle carrying military personnel in the Turkish capital. (Photo by Defne Karadeniz/Getty Images)
Now playing
01:17
Turkey: Deadly blast linked to Kurdish militants
turkey explainer turmoil nws_00000000.jpg
turkey explainer turmoil nws_00000000.jpg
Now playing
02:13
Turkey's year of turmoil
ANKARA, TURKEY - FEBRUARY 17: A firefighter tries to put out a fire as Turkish army busses burn after an explosion on February 17, 2016 in Ankara, Turkey.   At least five people have been killed and 10 injured in an explosion in the Turkish capital of Ankara in what appeared to have been a car bomb attack on a vehicle carrying military personnel.  (Photo by Erhan Ortac/Getty Images)
Erhan Ortac/Getty Images
ANKARA, TURKEY - FEBRUARY 17: A firefighter tries to put out a fire as Turkish army busses burn after an explosion on February 17, 2016 in Ankara, Turkey. At least five people have been killed and 10 injured in an explosion in the Turkish capital of Ankara in what appeared to have been a car bomb attack on a vehicle carrying military personnel. (Photo by Erhan Ortac/Getty Images)
Now playing
00:56
Turkey terror attack caught on video
turkey explosion terror attack watson lok_00011315.jpg
Cihan
turkey explosion terror attack watson lok_00011315.jpg
Now playing
02:53
Turkish military: Deadly explosion a 'terror attack'
ankara turkey terror attack lkl damon _00023111.jpg
CNN
ankara turkey terror attack lkl damon _00023111.jpg
Now playing
03:09
Turkish Military: Ankara explosion a terror attack
turkey ankara explosion damon phoner_00010401.jpg
CNN Turk
turkey ankara explosion damon phoner_00010401.jpg
Now playing
02:12
Powerful explosion in Ankara

Story highlights

NEW: Bomber who killed four in Istanbul on Saturday had connections to ISIS, says interior minister

Three of the dead were Israelis, two of whom had dual American citizenship

Iran media report one of the dead was from that country

(CNN) —  

A suicide bomber who struck a busy tourist area in central Istanbul on Saturday, killing at least four people, was a Turkish citizen with links to ISIS, Turkey’s Interior Minister Efkan Ala said Sunday.

Speaking to reporters in Istanbul, Ala identified the attacker as Mehmet Ozturk, who was born in 1992 and registered in Gaziantep, a city in southern Turkey, near the Syrian border.

“The evidence at hand shows that he is connected to the Daesh terrorist organization,” said Ala, using another name for ISIS.

“We are still considering with great sensitivity other connections or forces behind this. The fight against terror will continue.”

He said that security forces had said there had been no previous warrants issued for the bomber. Five others had been detained in relation to the attack, he said.

’Killing humanity’

Two of the four dead were American-Israeli dual citizens, according to an Israeli government source and a U.S. source.

A third Israeli was also killed in the attack, Israel’s Foreign Ministry said, and Iran state media reported that an Iranian was killed.

In addition to the fatalities, 36 people were injured in the blast, Turkish Health Minister Mehmet Muezzinoglu said.

“I condemn those who are killing humanity like this,” Muezzinoglu said.

Among the injured were 11 Israelis, officials said. It was unclear whether the suicide bombing was targeting Israelis, Prime Minister Benjamin Netanyahu said.

Since August 2014, Israel has advised its citizens to avoid nonessential travel to Turkey.

U.S. National Security Council spokesman Ned Price said the United States is steadfast in its support for Turkey.

“These repeated acts of terrorism in Turkey must come to an end,” Price said in a statement. “We are in close touch with Turkish authorities and reaffirm our commitment to work together with Turkey to confront the evil of terrorism.”

No claim of responsibility

Police cordoned off Taksim Square after the attack, as helicopters flew overhead and multiple ambulances gathered at the site.

Stunned shoppers ran away from the scene, some in tears.

No group immediately claimed responsibility.

NATO Secretary General Jens Stoltenberg condemned the attack as “yet another terrorist outrage targeting innocent civilians and our ally Turkey.”

“There can be no justification for terrorism,” he said in a statement. “NATO allies stand with Turkey, united in our determination to fight terrorism in all its forms.”

Days after deadly car bomb in Ankara

The attack came nearly a week after a car bomb ripped through a busy square in the capital, Ankara, on March 13.

The Kurdistan Freedom Falcons, or TAK – a militant offshoot of the Kurdish separatist group, PKK – boasted that it was behind that bombing, which killed 37 people. The group said on its website Thursday that its militants struck “in the heart of (the) fascist Turkish republic.”

The PKK, or Kurdistan Worker’s Party, seeks an independent state in Turkey and has been in an armed struggle with the government for decades. The United States and EU have designated both it and the TAK as terrorist organizations.

A ceasefire between the PKK and Turkey fell apart last summer, after which Turkey bombed the terror group’s positions in northern Iraq while also imposing curfews in crackdowns on heavily Kurdish areas in southeastern Turkey.

Some residents have accused Turkey of unjust collective punishment, saying security forces have acted with impunity and killed civilians.

Kurdish militant group warned tourists

The Kurdistan Freedom Falcons specifically have been tied to a number of horrific attacks on their own.

This includes a February bombing targeting military vehicles in central Ankara that killed 28 people.

The TAK called that attack “revenge” for Turkish military actions and threatened more violence – warning foreigners, especially, to stay away from Turkey.

“Tourism is one of the important sources feeding the dirty and special war, so it is a major target we aim to destroy,” the TAK said at the time.

CNN’s Gul Tuysuz reported from Istanbul and Faith Karimi reported from Atlanta. CNN’s Arwa Damon, Oren Liebermann, Mike Schwartz, Ray Sanchez, Tim Hume and Michael Martinez contributed to this report.