Deputies from the Santa Clarita Valley Sheriff’s Station wear tactical gear as they secure the perimeter at the statewide disaster drill for a mass-casualty event at Henry Mayo Newhall Hospital on Thursday, Nov. 16, 2017. Ryan Painter/The Signal
Henry Mayo conducts mass shooter exercise
Henry Mayo Newhall Hospital transformed into a disaster response scene Thursday as medical personnel, multiple law enforcement agencies and the FBI conducted a statewide exercise for an active shooter event…
