CNN —  

Two coalition service members died when two people wearing Afghan National Security Forces’ uniforms shot them on Wednesday, the NATO-led International Security Assistance Forces said.

ISAF and Afghan authorities are investigating the incident, which occurred in eastern Afghanistan.

Such insider attacks by Afghan troops or infiltrators on U.S. and allied troops – also called “green on blue” attacks – have killed dozens of coalition troops.

READ: 2 civilian contractors killed in Afghanistan were Americans

READ: Afghan girl has first case of polio in Kabul in 13 years