AUSTIN, Texas - St David's Healthcare is shedding some light on how the hospital system prepares for mass casualty events.

Hospital leaders say the system has a vast network of hospitals and emergency rooms across Central Texas and all of them have a trauma designation.

Only two hospitals - one in Round Rock and the other in South Austin - can provide level 2 trauma care. That's the highest care possible for the most critically injured patients.

To get those designations, hospitals must practice at least two mass casualty drills per year.

“It’s coordinated by local law enforcement and EMS and the type of simulations vary from year to year, but we have definitely had mass casualty shooting type scenarios,” says Ken Mitchell, M.D., senior vice president and chief medical officer of St. David’s HealthCare.