Turkish officials say they have arrested nine people, including three Russians, in connection to the suicide bomb attack in Istanbul on Tuesday.
All of them are suspected to be members of the militant group Islamic State. The suicide bomber who detonated the bomb that killed 10 German tourists had arrived in Turkey from Syria and registered as a refugee.
Police raided homes in Antalya and Izmir, which led to the arrests. No group has claimed responsibility for the attack so far.