(NBC NEWS) Three U.S. Army Special Forces soldiers were killed and two were wounded in Niger on Wednesday, in an ambush by suspected Islamic militants operating from Mali, multiple sources with knowledge of the incident told NBC News.

According to the sources, one soldier form Niger was also killed in the attack.

The U.S. military did not confirm the deaths officially, but did acknowledge that a “hostile fire” incident involving U.S. troops had occurred.

Note: Read our discussion guidelines before commenting.