The three men who carried out Tuesday’s deadly attack on an Istanbul airport were all from parts of the former USSR, Turkish sources say.
One is said to be from Russia’s North Caucasus region and the others from Uzbekistan and Kyrgyzstan.
Turkey believes so-called Islamic State (IS) was behind the suicide gun and bomb attack that left 43 people dead and 230 injured at Ataturk airport.
Police detained at least 13 suspects in Istanbul and more in Izmir on Thursday.
More details of the victims have emerged, many of them airport workers.