"A suspected U.S. drone strike against Islamic State in Afghanistan killed 18 people on Wednesday, most of them militants but possibly including some civilians, Afghan officials said. Civilian casualties in U.S. airstrikes against Taliban and other militants inAfghanistan have long been a source of friction between the allies who have been fighting since 2001 to end militant opposition to the government in Kabul. The strike in Nangarhar province, on the eastern border with Pakistan, killed 18 people, 15 of them militants and three civilians, said Mohammed Ali, police chief of Achin district where the attack occurred. “They were in a house to visit someone who had just come from the Hajj pilgrimage,” he said. “A drone targeted the house and killed most of them.”"