No German soldiers or planes were involved in the airstrike, but a German patrol made it to the site about 10 hours after the attack and came under small-arms fire, the German military said.

CNN: NATO begins probe into deadly Afghan airstrike

Many of the U.S. troops killed were soldiers operating in the Baghdad area who were struck by roadside bombs, small-arms fire and indirect fire, according to military reports.

CNN: Iraqi deaths spike in March

Last week at the White House, I was proud to welcome a remarkable cross-section of these supporters, including former Secretary of State James Baker, General Colin Powell, other military leaders, legislators, arms control experts and representatives from small and large businesses, religious groups and scientists.

CNN: Bill Clinton Speaks To A Meeting Of Newspaper Editors

"Afghan National Army forces and U.S. soldiers operating in the area quickly moved to the site and cordoned off the insurgent forces by use of small-arms fire and support from coalition fixed-wing and rotary-wing aircraft, " the military statement said.

CNN: Afghan officer, 20 insurgents dead

Tehran and Pyongyang have developed expansive military ties over the past three decades and have collaborated in developing missile systems, submarines and small arms.

WSJ: North Korea Nuclear Find Raises Fears It Will Share With Iran