"The policemen were being given training in Mingora town when a suicide bomber entered the grounds and blew himself up near the recruits, killing 14 of them," Swat police chief Qazi Ghulam Farooq told AFP.
A senior administration official, Ateef-ur-Rehman, confirmed the incident and said there were a number of casualties, adding police had been put on high alert against more attacks.
Another local senior police official, Mohammad Idrees, said a curfew has been imposed in Mingora, added troops and police are patrolling the town and people have quickly shuttered their businesses for fear of more bombings.
It was the first major attack in Mingora since the military claimed last month to have cleared the valley of Taliban militants, paving the way for residents, who had fled the area to avoid the fighting, to begin returning home.
AFP