VIDEO | Update: Mass Casualty Event has been Declared After Major horrific Crash in Orange County, California

A major situation is currently unfolding in Orange County, California, where officials have declared a Mass Casualty Event near the ongoing Airport Fire.
A wildland firefighter transport vehicle, carrying up to a dozen firefighters and emergency personnel, was involved in a horrific crash.

The exact cause of the accident is still unknown, but the impact has left numerous crew members seriously injured. Several medevac helicopters have arrived on the scene, airlifting multiple patients to nearby hospitals for urgent medical care.

Authorities have announced that the highway will be shut down for five hours as they investigate the cause of the crash. More updates are expected as details emerge video by @abc7chriscristi: