A NATO helicopter has crashed in eastern Afghanistan, killing two foreign troops on board.

Officials say the crash occurred Sunday in the Sabari district of Khost province. NATO says the cause of the crash is under investigation. It says there were no reports of insurgent activity in the area.

A Taliban spokesman claimed credit for bringing down the helicopter. However, the group is known to regularly exaggerate its claims.

In southern Afghanistan, another NATO soldier was killed in an insurgent attack. No further details were released.

In other violence, two security guards were killed in a bomb explosion at a Kabulbank branch in central Wardak province. The blast occurred as government employees lined up to collect their salaries.

And in eastern Nangahar province, Taliban militants killed the local counterterrorism official for Khogiani district in an attack late Saturday.