FORT BRAGG, North Carolina -  U.S. Special Operations Forces soldiers were injured in an explosion on Fort Bragg Thursday morning, the Associated Press reports.

Early reports indicate 15 soldiers were taken to the hospital by medical helicopter during an explosion that took place when a vehicle rolled at a remote location during training. 

The soldiers were taken to the Army base’s Womack Army Medical Center for treatment, said Lt. Col. Rob Bockholt, a spokesman for the U.S. Army’s Special Operations Command, which is based at Fort Bragg.

“There was an incident that occurred on one of the ranges,” Bockholt said. “We’re looking into exactly what happened.”

U.S. Army Special Command is investigating.

About 57,000 military personnel are attached to Fort Bragg, located next to Fayetteville, N.C. It is the largest Army installation by population and covers about 161,000 acres. The Special Operations Command has about 23,000 soldiers spread over several sites.