A roadside bomb targeted a security convoy in northwestern Pakistan on Friday, leaving three soldiers dead and more than a half-dozen injured, an official said.
The remote-controlled bomb was planted near a school building in the Jalala area of the Malakand district in the North West Frontier Province.
"Three soldiers died while seven more were wounded," said an intelligence official who spoke on the condition of anonymity. "One vehicle was destroyed in the blast."
A military spokesman confirmed the incident but refused to give details.
Major Nasir Ali said only that the blast was the result of a roadside bomb and the military was assessing the damage.
The site of the blast was located 25 km southwest of Mingora, the main town in the Swat district, where government forces are battling hundreds of armed Islamist militants trying to enforce Taliban-style rule in the area.
The militants, who are led by radical cleric Maulana Fazlullah, have carried out dozens of suicide and bomb attacks on security personnel as well as political leaders since 2007, killing scores of people.
They have also imposed a ban on education for girls, blown up shops selling music CDs, prohibited barbers from shaving beards and set up a parallel judicial system in the region.