Turkish authorizes reported on Sunday that DNA tests have confirmed the identity of Saturday’s Istanbul suicide bomber who killed three Israelis and one Iranian citizen.

Mehmet Ozturk, a 23-year-old terrorist affiliated with ISIS, has been named as the attacker in the deadly blast that rocked a popular Istanbul shopping center.

Initially Turkey had named Kurdish separatists affiliated with the PKK as being suspects, but later shifted their investigation to ISIS members.

The bomber’s DNA, found at the scene of the attack, was compared to samples taken from Ozturk’s family, confirming the identity of the attacker.

Ozturk was a native-born Turkish national from the southern city of Gaziantep, just 60 miles (95 kilometers) from the Syrian city of Aleppo.