One U.S. service member died and two were injured on Tuesday during an attack near Marjah in Helmand Province, Afghanistan.
The military said it could not release any more information until next of kin were notified.
News reports said that the casualty and injuries were the result of two attacks. A group of special operators was attacked during a mission, NBC News reported. Then, a helicopter arriving at the site of that attack for medical evacuation came under fire. It was unclear if the medevac helicopter was damaged.
Marine Corps Times reported than an Air Force HH-60H Pave Hawk helicopter was called in to evacuate the wounded, and is now having mechanical problems, citing Army Col. Michael Lawhorn, spokesman for Operation Resolute Support.
"We are deeply saddened by this loss," Brig. Gen. Wilson Shoffner, a spokesman for U.S. Forces Afghanistan, said in a statement. "On behalf of General Campbell and all of USFOR-A, our heartfelt sympathies go out to the families and friends of those involved."
The U.S. death comes just weeks after six American service members were killed in Afghanistan.
About 10,000 U.S. forces are in Afghanistan and will remain there through most of this year.