Bombers trained at the facility were being used in attacks across the Swat valley, including on the main vity of Mingora, the statement said.

Last week two suicide attacks on consecutive days killed at least seven people in the district.

The military is winding down a three-month offensive aimed at pushing Taliban fighters out of the Swat valley and the surrounding areas.

Although Islamabad has claimed success in the battle and the two million people displaced by the fighting have largely returned, sporadic clashes continue to take place across the region.