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NATO says service member killed by man wearing an Afghan security forces uniform

A worker walks past Afghan guards as they wait for a news conference that has been delayed between U.S. Secretary of State John Kerry and Afghan President Hamid Karzai at the presidential palace on the second day of an unannounced stop in Kabul, Afghanistan, on Saturday, Oct. 12, 2013. Kerry extended talks Saturday with Karzai on a bilateral security agreement with the United States, and while work remains to be done a deal could be struck by the end of the day, a presidential spokesman said.  (AP Photo/Jacquelyn Martin, Pool)

A worker walks past Afghan guards as they wait for a news conference that has been delayed between U.S. Secretary of State John Kerry and Afghan President Hamid Karzai at the presidential palace on the second day of an unannounced stop in Kabul, Afghanistan, on Saturday, Oct. 12, 2013. Kerry extended talks Saturday with Karzai on a bilateral security agreement with the United States, and while work remains to be done a deal could be struck by the end of the day, a presidential spokesman said. (AP Photo/Jacquelyn Martin, Pool)  (The Associated Press)

NATO says a man wearing an Afghan national security forces uniform killed one of its service members in eastern Afghanistan.

The alliance says in a statement that the incident occurred on Sunday, but provided no other details or the nationality of the soldier.

It says an investigation has been launched. Most of the foreign forces serving in the east are from the United States.

At least 15 foreign soldiers have been killed this year in so-called insider attacks, compared to a total of 62 for all of last year.

A total of 133 coalition soldiers have been killed so far this year, including 104 Americans.