In a separate operation, 20 more militants were killed and several others injured in Tirah Valley of Khyber Agency bordering Afghanistan, the report said citing sources with the paramilitary Frontier Crops (FC).

Pakistani troops are wrapping up a 10-week offensive to expel Taliban from Swat and three neighbouring districts.

So far, over 1,700 militants and 160 soldiers have been killed in the army operations in the region, known for hilly terrain and thickly forested valleys.

The fighting displaced over 1.9 million people, who have started going back to their homes after the army took control of major towns. But violence continues, as the army has been trying to clear the remote northern belt of the Swat region.