US-led coalition troops clashed with a group of Taliban fighters in northern Afghanistan on Sunday, killing six terrorists, while four others were killed in a battle in the south, officials said. In the north, troops returned fire after being attacked by terrorists while on patrol in the volatile Tagab valley of Kapisa province, said coalition spokesman 1st Lt. Nathan Perry. Rahimullah Safi, the province's deputy governor, said six gunmen were killed in the clash, while Perry said "multiple militants" were killed. Tagab is close to where terrorist killed 10 French troops Tuesday in the deadliest ground attack on foreign troops since the Taliban were ousted from power in 2001. In southern Helmand province Sunday, four gunmen were killed by NATO aircraft and Afghan troops, the military alliance said in a statement.