Two police officers were killed in a car bomb explosion in southeast Turkey on Sunday.
The blast targeted police headquarters in the city of Gaziantep.
At least 22 people were wounded, 18 of them police and four civilians.
Some reports say automatic weapons were fired as two vehicles approached the police station on Sunday morning, one of which blew up.
The province of Gaziantep, bordering ISIL-held territory in Syria, is home to many Syrian refugees.
A suspected ISIL militant is reportedly thought to be behind the attack. Security sources say his home in the city has been raided and his father detained.
Turkey is facing security threats on several fronts with recent deadly blasts blamed on ISIL and Kurdish militants.
Also on Sunday, several hundred miles eastwards along the same border, in the town of Nusaybin, three Turkish soldiers were killed and 14 others wounded in an armed attack by Kurdish militants during a military operation, an army statement said.