Report: US Special Forces under attack in Afghanistan

According to an NBC report citing American defense officials, an unknown number of US Special Operations Forces were wounded during a counterterrorism operation in southern Afghanistan on Tuesday.

The forces came under heavy enemy fire in Helmand Province in which a US medevac responding in the area, also came under fire.

It was not clear if the helicopter had been hit or whether any casualties were sustained however, the US helicopter landed safely in Marjah in Helmand Province after mechanical malfunctions, Reuters reports citing a US military spokesman.

Army Colonel Michael Lawhorn, spokesman for the Resolute Support mission in Afghanistan, said he could not yet comment on whether there were any troops killed or wounded.

A spokesman for the NATO coalition in Afghanistan earlier told NBC News that a U.S. helicopter had "landed" in Helmand province and was "experiencing mechanical problems."

US officials say medevac had been called in to recover casualties from counter-terrorism operation against enemy forces in Afghanistan's Helmand province when area around landing zone came under fire; unclear if additional casualties occurred during attempt to transport