From Yahoo News:
Helicopter crashes killed 14 Americans on Monday — 11 troops and three drug agents — in the deadliest day for the U.S. mission in Afghanistan in more than four years. The deaths came as President Barack Obama prepared to meet his national security team for a sixth full-scale conference on the future of the troubled war.
The heaviest single-day loss of life since 2005 and incredibly, it was two separate incidents.
In the deadliest crash, a helicopter went down in the west of the country after leaving the scene of a firefight, killing 10 Americans — seven troops and three Drug Enforcement Administration agents. Eleven American troops, one U.S. civilian and 14 Afghans were also injured.
In a separate incident, two U.S. Marine helicopters — one UH-1 and an AH-1 Cobra — collided in flight before sunrise over the southern province of Helmand, killing four American troops and wounding two more, Marine spokesman Maj. Bill Pelletier said.
CNN is now reporting. CNN reports that the US military does not believe that hostile fire was not involved in either incident.