A field explosion at Fort Bragg on the morning of Sept. 14 has left 8 soldiers injured.

Authorities told WRAL that the soldiers were wounded in an explosion at Range 76 on the North Carolina post. The victims, all members of Army Special Operations Command, were being transported to Womack Army Medical Center via helicopter.

“There are injuries but we don’t know the extent,” Special Operations Command spokesman Lt. Col. Rob Bockholt told Fox News.

Army officials have not yet determined the cause of the explosion, either.

Fort Bragg, which is home to 50,000 active-duty soldiers, is the largest Army base in the world. Range 76 is often used for live-fire training exercises.

Update (9/14/2017; 3:10 PM EDT): The military initially reported 15 injuries in the explosion, but updated that information this afternoon to reflect that eight soldiers were injured.Task & Purpose has updated this story and will continue to do so as more information becomes available.