At least 12 policemen were killed and over 25 others injured when a suicide bomber struck a police station in Pakistan's troubled northwestern Swat valley on Sunday.

The bomber climbed over a wall and entered a ground in the police station in Mingora, the main city in Swat district, where about 60 personnel were being trained, and blew himself up. North West Frontier Province (NWFP) Information Minister Mian Iftikhar Hussain said at least 12 policemen were killed. Other officials said more than 25 personnel were also injured.