ISTANBUL — The three suicide bombers who killed 44 people at Istanbul’s main international airport this week have been identified as citizens of Russia, Uzbekistan and Kyrgyzstan, Turkish officials said Thursday.

Turkey, which has blamed the Islamic State for the attack, carried out raids across the country on Thursday, detaining 13 people, including three foreigners, in connection with the attack at Istanbul Ataturk Airport on Tuesday night.

There were 238 people wounded in the attack, and 94 of them were still in the hospital, the governor of Istanbul, Vasip Sahin, said Thursday.

No group has claimed responsibility for Tuesday’s attack.

Although Russian-speaking units of the Islamic State have played an important role on the battlefield in Iraq and Syria, if the preliminary identifications of the Istanbul attackers are confirmed it will signify the first time that such fighters have taken part in a major external operation on a Western target.