A man and his two sons were killed at their home in Ghani Khel, a district in the south of Nangarhar, on the border with Pakistan, said Attaullah Khogyani, a spokesman for the provincial governor.
Another soldier was wounded and the attacker was killed. The Achin district in eastern Nangarhar province, where the attack took place, is also thought to be a stronghold of IS.
USA military officials have not received any official reports of civilian casualties in the wake of an attack on a U.S.
An American official said the soldiers were shot in an apparent insider attack, also known as a "green-on-blue" incident because of the color-coding system used by North Atlantic Treaty Organisation. The soldier's condition was not immediately available Monday.
Claims of civilian casualties remain a contentious issue in the war against insurgents in Afghanistan, as President Donald Trump mulls sending more troops into the lengthy conflict.
USA troops in #afghanistan will have to battle a growing number of #ISIS fighters in Afghanistan as Taliban groups in the country are joining the Islamic terror group.
Young woman in U.S. leak case faces day in court
The charge, willful retention and transmission of national defense information, could bring victor up to 10 years in prison. She has been jailed in neighboring Lincoln County since her arrest, according to a booking report released by the sheriff.
That count found conflict-related civilian casualties in Afghanistan rose to 11,418 in 2016, including 3,498 people killed and 7,920 wounded.
"In (a) joint US-Afghan military operation".
Also over the weekend, an American air strike in southern Afghanistan killed at least three Afghan policemen and wounded several during a joint operation by Afghan and USA special forces.
The potential troop surge would range from between 3,000 to 5,000 soldiers, including Special Operations forces, unnamed officials told U.S. media.
There are about 8,400 United States troops in Afghanistan.
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