In Afghanistan's western province of Farah, local officials say an attack by the Taliban killed 18 soldiers and special forces. Taliban fighters ambushed troops assembled to prepare an offensive in the Bala Buluk district. US and Afghan officials say the Taliban have been under pressure from air strikes and military operations. But the insurgents have repeatedly demonstrated their ability to inflict damage on Afghan forces. This week's incident was the latest in a series of attacks in Farah.