Bomb attacks in Afghanistan claimed the lives of three US soldiers on Saturday, as NATO and Afghan forces killed 25 Taliban fighters in separate assaults. In the deadliest incident reported Saturday, an air strike killed 20 militants late Friday in Urgun district, in southern Paktika province, said Hamidullah Zawak, spokesman for the provincial governor. The Afghan defence ministry said meanwhile five militants were killed in an Afghan army commando operation on Friday in the Gereshk district of Helmand province, also in the south. In Sangin district, also in Helmand, one Afghan soldier was killed and another injured during a small-arms attack, the ministry added.