A suicide car bomber killed four security forces and wounded passing schoolchildren Tuesday in Pakistan’s volatile northwest, where the government is under pressure from Washington to crack down on militants.

A senior police official says a suicide car bomber has killed at least four paramilitary security forces in northwestern Pakistan.

At the entrance to Peshawar, a young man on the side of the road offers a prayer, while on the bridge overhead three men videotape him.

Taliban militants packed up their grenade launchers Friday and vacated a district they overran outside the country’s capital last week. The move did little, however, to quell the alarm of the U.S. and Western allies.

A senior official says Taliban militants have begun pulling out of a recently seized district of northwestern Pakistan and are returning to their stronghold in the Swat Valley.

Police say gunmen fired on a vehicle escorting paramilitary troops through a Pakistani district recently infiltrated by the Taliban.

A government official says six platoons of paramilitary troops have been sent to a Pakistani district recently infiltrated by the Taliban.

Two loud explosions on Sunday shook a northwest Pakistan militant stronghold that has been the frequent target of U.S. missile strikes, a local resident said.

A suicide bomber rammed an explosives-laden vehicle into a military checkpoint in Pakistan’s troubled northwest on Saturday, killing at least 20 people, officials said.

Pakistani police say a suicide bomber has killed 10 people at a checkpoint in the country’s northwest.