Six insurgents were killed as part of Operation Mountain Lion in eastern Kunar province, where seven children were killed Tuesday in a rocket attack blamed on militants.Afghan and coalition soldiers killed six insurgents in eastern Afghanistan Wednesday as they launched a new 2,500-troop operation with predawn air and ground strikes, the coalition said. "The operation began with predawn air-and-ground assaults today (Wednesday) in the Pech River Valley, an area notorious for terrorist activity," the coalition said in a statement. The insurgents were killed in a neighbouring district of the province, which borders Pakistan. The operation, involving 2,500 troops from the Afghan army and various coalition regiments, aimed to "disrupt insurgents activities, deny them sanctuary and prevent their ability to resupply," it said. It was a "comprehensive effort to kill, incapacitate or capture terrorists operating in the region" that would continue "as long as necessary." On Tuesday, seven children were killed and 30 wounded when a rocket slammed into a primary school yard, in an attack blamed on Taliban militants and allies.