PESHAWAR - Three persons killed and one injured when unknown gunmen opened firing on a vehicle in the limits of Kabal police station in Swat district on Sunday evening, police said.

According to Swat police, the assailants ambushed a vehicle with four persons on board near Kalagai Bakro area, killing three of them and injuring another.

The identity of victims could not be immediately ascertained. Police rushed to the spot and cordoned off the area. The motive behind the incident was stated to be old enmity.