Updated at 12:25 p.m. Jan. 6, 2016

Recent mass shootings in the United States and overseas prompted Cal State San Marcos to schedule a pair of active-shooter drills Wednesday involving police officers, firefighters, and medical personnel.

The exercises were taking place in the University Student Union, but were not open for public viewing.

Twenty to 30 students portrayed “victims” and screams were piped into the building to demonstrate what it would be like if there really was an active shooter on the North County campus.

“It’s important that we collaborate with law enforcement to ensure that mutual aid is effective if something were to happen here, and to give our law enforcement the opportunity to train — if it doesn’t happen here it could potentially happen in another place in North County or San Diego,” CSUSM spokeswoman Margaret Chantung told NBC7/39.

According to a statement issued by the university, school officials want to make sure they’re prepared for an emergency following recent shootings in San Bernardino, Colorado Springs, Paris and Roseburg, Oregon. The latter took place on a college campus.

Participants include the CSUSM University Police Department, San Diego County Sheriff’s Department, San Marcos Fire Department, Escondido Fire and Police departments, Palomar Hospital, Scripps Memorial Hospital Encinitas, Scripps Memorial Hospital La Jolla and Rady Children’s Hospital.

CSUSM officials said residents and motorists may notice emergency vehicles, including medical helicopters, ambulances, fire trucks and patrol cars on campus and the surrounding community. Traffic control measures were implemented throughout campus, which is on winter break.

—City News Service

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