Peshawar, Nov 16 - At least three people were killed and 21 injured Monday morning in a powerful explosion in the outskirts of this Pakistani city, an official said.

The blast -- near a police station -- took place at 7.45 a.m. in Badhbeer, which is located in the outskirts of the North-West Frontier Province capital.

District Coordination Officer (DCO) Peshawar Sahibzada Anis said three people died in the blast, Geo News reported.

The blast was so powerful that a nearby mosque collapsed, Anis said, adding some people may be trapped under the rubble.

The wounded include children and women.

Pakistan has been struck by a series of terror attacks since Oct 5, when the latest wave of violence was unleashed by Taliban which is battling the army in the rugged terrain of South Waziristan.