US troops had opened fire on and killed three Afghan civilians, including two children, following a bomb attack that hit their vehicle at a district near the border with Pakistan.
The troopers shot and killed an Afghan man and his two sons in Ghani Khel, a district in the south of Nangarhar, according to a spokesman for the provincial governor Attaullah Khogyani.
"After the bomb blast hit them, the American forces started shooting and killed one man and two children nearby," he said.
The details of the incident were not immediately clear. The US military command in Afghanistan said it had launched an investigation.
Source: News Agencies, Edited by website team