TEMPLE, Texas – The toll from the shooting rampage at Fort Hood stood at 13 dead and 30 injured late Friday, but the chairman of surgery at the hospital treating 10 of the survivors warned that some were still at risk of dying.

Dr. W. Roy Smythe of Scott & White Memorial Hospital said some of the wounded had "extremely serious injuries" and that several were at "significant risk" of losing their lives.

"Not everyone is out of the woods," Smythe said. "We would hope that all would survive, but it's too early to tell."

During a news briefing Friday, he said six remained in intensive care, and at least two faced additional surgeries.

Some victims were shot multiple times. Most of the patients were unconscious or using breathing tubes when they arrived at Scott & White.

Smythe was in his office Thursday afternoon when an alert sounded to mobilize the trauma team at the hospital, the only Level 1 trauma center between Austin and Dallas.

With the shooting victims arriving quickly, surgeons worked in up to a half-dozen operating rooms.

The Army hasn't released the names of shooting victims yet, but the families of 11 of those killed have identified their loved ones.

Staff writers Dave Tarrant and Michael E. Young, wire reports