FORT BRAGG, N.C. — A soldier killed in a demolition accident was training to become a Green Beret experienced in handling explosives.

Staff Sgt. Alexander Dalida of Dunstable, Massachusetts, died Thursday at Fort Bragg during training exercises involving demolitions.

Investigators haven't said whether an explosion caused his death, U.S. Army Special Operations Command Lt. Col. Robert Bockholt said Friday.

Seven other soldiers were injured. Bockholt said he did not know what their conditions were.

All of the soldiers were students from the John F. Kennedy Special Warfare Center and School, which is based at Fort Bragg, Army officials said.

Dalida, 32, was enrolled in an approximately yearlong course to become part of the U.S. Army Special Forces, also known as Green Berets. He was learning engineering skills as part of the course in which students are trained in occupational specialties. Special Forces engineers are specialists in demolitions, and also have skills necessary for building field fortifications and bridges, according to the Army's recruiting website.

His previous military training included working with MH-60 helicopters, airborne operations and learning how to survive while evading capture.

"Staff Sgt. Dalida's death is a reminder that a Soldier's job is inherently dangerous," Maj. Gen. Kurt Sonntag, the school's commander, said in a statement.