The U.S. military apologized for the deaths and senior worldwide diplomat in Afghanistan said authorities are investigating the possibility the incident could be connected to the shooting by the Afghan soldier.
In a statement, the Pentagon said the wounded soldier had been evacuated for treatment and the incident was under investigation.
In a statement, the Taliban claimed responsibility for the attack, claiming the soldier was a Taliban infiltrator.
A White House spokesperson traveling with Donald Trump in New Jeresey said the United States president was aware of and following the situation.
"The Afghan army soldier was killed in return fire", Attaullah Khogyani, spokesperson for the governor of Nangarhar province.
The apparent insider attack occurred Achin, an Islamic State stronghold along the Pakistan border in Nangarhar province. In mid-March, three U.S soldiers were shot and wounded in another apparent insider attack at an Afghan military base in Helmand province.
A Taliban spokesman claimed the shooter was a part of the militant group and had killed four Americans and injured several more, but this has yet to be confirmed by government sources.
"On my way here I was informed that US servicemembers were killed and wounded in an attack in Afghanistan", Pence said.
British and European Union negotiators to launch Brexit talks on Monday
However, a deal with the DUP also risks destabilizing Northern Ireland by increasing the influence of pro-British unionists. Thus we must begin this negotiation.
The commando was also killed in the incident, Khogyani said.
Civilian casualties from both U.S. and Afghan air raids increased dramatically past year, according to the UN's most recent report on threats to civilians.
Editor's note: This story is developing and will be updated as soon as additional information is available.
The district is also where the USA dropped one of its most powerful bombs earlier this month, killing close to 100 ISIS fighters, according to Afghan officials.
This type of incident, known as a "green-on-blue" attack, is not uncommon in Afghanistan.
USA casualties in Afghanistan have been decreasing lately, but Achin has emerged as a particularly deadly point for US troops this year.
Either way, the USA offered "deepest condolences" for killing the Afghan security forces.
There are now 8,400 American troops in Afghanistan training, advising and assisting the Afghanistan army.
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