However, Turkish officials have not confirmed Chatayev’s involvement. It’s believed the three attackers are from Russia, Uzbekistan and Kyrgyzstan, and entered Turkey a month ago. The terrorists rented an apartment in the Fatih district of Istanbul after they arrived from Syria. Two of the attackers were also identified: Rakim Bulgarov and Vadim Osmanov carried out suicide bombings at the airport. Last year, the U.S. Treasury added Chatayev to its list of terrorists. Many Chechens or Dagestanis from the largely Muslim North Caucasus region of Russia are the largest group of soldiers in ISIS from a non-Muslim majority country. No one has claimed responsibility for the airport assault. Authorities have detained other 24 people in connection with the attack investigation, including 15 foreign nationals.