Kurdish rebels detonated a car bomb outside a police station in southeastern Turkey killing at least three people.
The attack targeted a police control post on the highway leading southeast from Diyarbakir to the city of Batman, according to the local governor's office.
Officials say 25 people were wounded in the attack including several police officers.
The blast tore a large crater into the ground and also destroyed a building.
Police have blamed the attack on rebels from the Kurdistan Workers' Party (PKK).
The PKK has been targeting Turkish police and military in its struggle for autonomy in Turkey's southeast since the collapse of a cease-fire agreement nearly a year ago.
Last week, at least 12 people were killed in a wave of PKK attacks targeting Turkish police and soldiers in the mainly Kurdish southeast.