A man in an Afghan police uniform shot and killed an international service member on Sunday, NATO said, raising the death toll to 10 in such attacks in the space of just two weeks.

The surge in violence by Afghan allies against their international partners has raised doubts about the ability of the two forces to work together at a key transition time. Afghan forces are expected to take over security for the country by the end of 2014, when the majority of international combat forces are scheduled to leave.

On the other side, a coalition airstrike killed dozens of Taliban militants, including one of their leaders, officials said.

Few details were immediately available about Sunday's killing of a coalition member in southern Afghanistan. NATO said only that they and Afghan authorities were investigating. Afghan officials could not be reached for comment.

The Taliban have been actively recruiting members of the Afghan security forces, saying in a statement last week that they considered these turncoat attacks a major part of their strategy against international forces.