Story highlights Two police officers dead, 22 people injured

Explosion caused by a car bomb, governor says

Turkey has been hit by a series of attacks claimed by ISIS or Kurdish militants

(CNN) A car bomb in front of a police headquarters in southeastern Turkey killed two officers and left 22 people injured Sunday, the country's semiofficial Anadolu news agency reported.

The explosion struck at 9.20 a.m. Sunday morning in front of the local police headquarters in the city of Gaziantep, Gaziantep Gov. Ali Yerlikaya said, according to Anadolu.

The injured included 18 police officers and four civilians, the agency reported, citing health officials.

Footage from CNN Turk showed ambulances at the scene, as authorities secured the site of the blast.

There was no immediate claim of responsibility.