Turkish investigators were scrambling Sunday to identify the bomber who blew himself up in the heart of Istanbul, killing four foreigners in the latest bloodshed to rock the country, AFP reports.
No group has yet claimed responsibility for Saturday's blast, which killed three Israelis and an Iranian.
Local media said "Islamic State" (ISIS) terrorists were suspected of being behind the latest attack which targeted Istiklal Caddesi, a bustling pedestrian street in central Istanbul that is lined with shops and cafes.
The suspected bomber was named by pro-government media as Savas Yildiz, a 33-year-old Turkish national.
Dogan news agency said DNA samples had been taken from the suspect's father to try to obtain a match with the attacker.