Three suicide bombers in the deadly gun and bomb attack on the international airport in Istanbul were from Russia, Uzbekistan and Kyrgyzstan, the Turkish official said.
The official gave no further details of the nationalities of confirming the attackers “and declined to be named because the details of the investigation has not yet been released.
Forensics teams struggled to identify the bombers on their limited residues, said earlier officials.
Three bombers opened fire to create panic outside, before the two of them got inside the terminal building and blew themselves up.
The third detonated an explosive device at the entrance. At least 43 people, including 19 foreigners, were killed and over 242 injured.
Turkish police also rounded up 13 suspects in the attack at the airport, according to the state news agency Anadolu.
Police conducted simultaneous raids at 16 addresses in Istanbul on Tuesday evening, Anadolu reported, adding that three suspects were foreigners.
Turkish officials and US officials say, ISIL, also known as ISIS, is responsible for the guns and the explosion at the third busiest airport in Europe, in a series of deadly suicide bombings in Turkey this year.