This is a developing story...
Two US soldiers have been killed after an Afghan army soldier opened fired on them in eastern Afghanistan, an Afghan official told the Associated Press.
Attahullah Khogyani, spokesman for the provincial governor in Nangarhar province, told the AP Saturday that two other US soldiers were wounded in the attack, which took place in the Achin district.
He said the Afghan soldier was killed after the attack.
The insider attack was similar to an incident in March, when an Afghan soldier opened fire at a base in Helmand Province, wounding three US soldiers.