The international military coalition in Afghanistan says a man in an Afghan army uniform turned his weapon on his international trainers in the country's east, killing three of them.

A coalition statement released few other details about Saturday's insider attack, the latest in which infiltrators or disgruntled Afghan police or soldiers have killed international troops working with them.

"We can confirm 2 U.S. service members and 1 U.S. civilian were killed today when an individual wearing an ANA uniform turned his weapon against the ISAF service members in eastern Afghanistan. ISAF and Afghan officials are assessing the incident and more information will be released as appropriate. It is ISAF policy to defer casualty identification procedures to the relevant national authorities," an ISAF press officer told Fox News.

The Associated Press contributed to this report.