A bombing has killed at least three people near a police complex in the eastern Pakistani city of Lahore.
Lahore police chief Haider Ashraf said several people were also wounded in the blast on February 17.
Some reports said the explosion was followed by gunfire.
No group immediately claimed responsibility for the attack.
Pakistan faces a Taliban insurgency and other threats from Islamic extremist groups.
Security forces have stepped up their efforts against militancy after Taliban fighters killed 151 people in a December 16 school massacre in the northwestern city of Peshawar.