NATO contractor killed in Afghan 'insider attack': officials

A NATO civilian contractor was killed by three people wearing Afghan security force uniforms on Friday in the latest suspected "insider attack" to target the international military coalition.

"The civilian died when three individuals wearing Afghan uniforms and driving an Afghan security force vehicle forced their way into the base in eastern Afghanistan," a spokesman for the NATO-led force said.

The spokesman said that all three of the attackers were killed by Afghan and ISAF (International Security Assistance Force) troops.

Afghan officials, who declined to be named, said the attack occurred in the Tagab district of Kapisa province.

NATO soldiers are fighting alongside Afghan colleagues to thwart Taliban militants. But more than 60 foreign soldiers were killed in 2012 in "insider attacks" that have bred mistrust and threatened to derail the training process.

If the attackers are confirmed to be Afghan security personnel, it would be the first insider attack since January when a British soldier was shot dead by an Afghan soldier.

Afghan soldiers and police are taking on responsibility for battling the militants from 100,000 NATO troops who will leave by the end of next year -- more than a decade after a US-led invasion brought down the Taliban regime.