A suspected US drone strike against Islamic State in Afghanistan has killed 18 people, most of them militants but possibly including some civilians, Afghan officials said.
Civilians casualties in US air strikes against Taliban and other militants in Afghanistan 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.
Wednesday's 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."
Provincial police spokesman Hazrat Hussain Mashriqiwal said several IS leaders had been killed, but he denied there were any non combatants among the victims.
Islamic State has enticed hundreds, perhaps thousands, of fighters in Afghanistan and Pakistan to join, and it holds some territory in Nangarhar, with Achin a stronghold.
But it has not been able to expand its influence in Afghanistan beyond a few districts and the Taliban remain the dominant Islamist force.
A spokesman for the US military command in Kabul confirmed that US forces conducted a "counter-terrorism" air strike in Achin, but would not discuss the details of the target.
"US Forces - Afghanistan takes all allegations of civilian casualties very seriously," said Brigadier General Charles Cleveland.
"We are aware of some claims of Afghan casualties, and are currently reviewing all materials related to this strike. We are continuing to look into these allegations."
Determining which victims were civilians and which were militants would not be possible until an investigation was complete, said Attaullah Khogyani, a spokesman for the provincial governor.
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