NORFOLK, Va. - The two FBI agents who died while training off the Virginia Beach coast were part of the agency's elite hostage rescue team, a group known most recently for rescuing an Alabama boy from an underground bunker.

It will likely be weeks before a cause of death is determined for Special Agents Christopher Lorek and Stephen Shaw because the state medical examiner's regional office is waiting for toxicology results.

The FBI has declined to say what kind of training the men were doing when they were killed Friday.

The team is trained in military tactics and outfitted with combat-style gear and weapons. Some of their preparation consists of scuba diving, dropping quickly out of helicopters, and battling in close quarters.

Dale Gauding, a spokesman for Sentara Healthcare, said the men were brought to Sentara Norfolk General Hospital in a helicopter, but he declined to say what their conditions were upon arrival, deferring questions to the FBI.

The hospital is the area's only Level I Trauma Center and burn trauma unit.