ISLAMABAD , Pakistan ( CNN ) -- Government airstrikes killed 20 Taliban militants in the past 24 hours in northwest Pakistan , a military source said Monday . Residents sift through the rubble of a bombed out school near Peshawar city . The airstrikes were launched in the village of Charmang , as part of an attempt to retake small pockets of Bajaur Agency , according to the source . CNN could not confirm the casualties because of access and safety reasons . The operation is going on in north and south Waziristan , the source added , particularly to clear supply routes and prepare for a major operation against Pakistan 's Taliban chief , Baitullah Mehsud , who has ties to al Qaeda . The Pakistani military has been conducting an offensive against the Taliban , centered in the Swat region of North West Frontier Province . Also Monday , a police officer and two civilians were killed when a suicide bomber drove an explosives-laden vehicle into a police checkpoint near Peshawar . And on early Sunday morning , a bomb blast destroyed a girl 's school east of Peshawar city , authorities said . No one was in the school building at the time , but two people who live in houses near the school suffered minor injuries .
Airstrikes launched in attempt to retake small pockets of Bajaur Agency . - On the other hand, Pakistan has been bombing and shelling Afghan positions for over a year now. Sunday : Bomb blast destroys girl 's school east of Peshawar city .