Seven Americans wounded in attack on NATO base in Afghanistan

KUNDUZ, Afghanistan - Reuters

Afghan policemen run for cover during clashes with protesters in Kabul February 24, 2012. REUTERS Photo

Seven U.S. military trainers were wounded on Sunday when protesters in Kunduz in northern Afghanistan threw a grenade at their base, provincial police chief Samihullah Qatra told reporters.

NATO's International Security Assistance Force (ISAF) confirmed there had been an explosion outside one of its bases in northern Afghanistan, but declined to comment on casualties.