Official: Turkey bombers from Russia, Uzbekistan and Kyrgyzstan

230 people. An official claim of responsibility has not been forthcoming.

Earlier Thursday, nine suspects linked to the group, also known as ISIL or ISIS, were arrested in large-scale police raids in the coastal city of Izmir, Anadolu reported.

Police said they found three hunting rifles and documents relating to the extremist group during the searches, according to the agency.

Turkish authorities declared a day of national mourning after the attack, which was carried out by three suicide bombers late Tuesday.

The three attackers arrived together at the lower-level arrivals hall; one went inside, opened fire and then detonated his explosives, an Interior Ministry official and another official told the Associated Press. During the chaos, the second attacker went upstairs to departures and blew himself up. The officials spoke on condition of anonymity because they were not authorized to speak publicly about the investigation.

The third man waited outside during the whole episode and detonated his explosives last as people flooded out of the airport, officials said.

President Obama phoned Turkish President Recep Tayyip Erdogan on Wednesday to express his condolences. He also pledged to dismantle “organizations of hate,” saying the attack in Istanbul shows how little these “vicious organizations” have to offer.

Contributing: Victor Kotsev and Onur Erem