The deaths come at a delicate time within the 18-year-old conflict, with Donald Trump, the US president, desperate to deliver troops residence and finish the longest battle in US historical past.
The incident occurred late Saturday at a base in Sherzad district, in Nangarhar province, jap Afghanistan.
“Current reports indicate an individual in an Afghan uniform opened fire on the combined US and Afghan force with a machine gun,” US Forces-Afghanistan spokesman Sonny Leggett mentioned in a press release on Sunday.
The defence ministry mentioned one Afghan soldier was killed and three native safety forces injured through the taking pictures, and added that an investigation had been launched whereas vowing to proceed preventing “terrorism” with the US.
“Incidents such as this fail to have negative effects on the friendship and spirit of cooperation and between the ANDSF and US military forces,” the ministry mentioned in a press release.
Provincial governor Shah Mahmood Meyakhil had earlier mentioned it was not instantly clear if the incident was a deliberate act by an “infiltrator” or an accident.
Mr Leggett additionally burdened the trigger or motive behind the assault weren’t instantly identified.
In a tweet, the US Military’s seventh Particular Forces Group (Airborne) mentioned “several” of its troopers had been killed or injured throughout fight operations in Afghanistan.
In response to Sherzad resident Najeebullah – who goes by one title – gunfire might be heard coming from an Afghan safety forces base close by late Saturday adopted by speedy air evacuations.
“We heard the sounds of gunfire and immediately helicopters landed inside the base and evacuated the casualties,” added Najeebullah.
No group instantly claimed duty for the incident.
Taliban spokesman Zabihullah Mujahid later declined to touch upon the incident, saying in a message despatched to AFP solely that the insurgents have been “investigating” the assault.