University of Maryland (UMD) Police are encouraging students and faculty to participate in their active shooter training.

On Monday, the department tweeted "Do you know what to do in an Active Shooter situation? RUN. HIDE. FIGHT." and included information to request a training session.

Police say they posted the tweet because they received an influx of training request after the attack at Ohio State University.

"We started receiving more calls shortly thereafter. As soon as the information became public of what had happened [at OSU]," said Captain Kenneth Ecker.

The "run, hide, fight" protocol was developed by the Department of Homeland Security and the City of Houston in 2011.

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The University of Maryland began offering it on their campus roughly four years ago.

It's name a "run hide fight" breaks down into steps.

The first one, Ecker said, is run.

"We want you to evacuate if it's possible."

The second, hide.

"If you can't run we want to make sure that you pick a location that you can hopefully secure. If not you barricade the door."

"Turn off your ringer," Ecker added. "Turn off your vibrate on your cellphones. Turn out the lights."

The third, fight.

It's something Ecker calls a "last resort."

"You choose which one you want, out of the run, hide, fight - but it's going to be your choice."

No matter the situation, an active shooter or someone with a knife, Ecker said this type of training saves lives.

"The best way for your survival is to have a plan. The plan is not to be developed when an incident goes on," he said.

The phrase was one of the first things Ohio State told students and faulty to do when, police say, Abdul Artan drove his car in to people on a sidewalk, got out, and then started to stab passerby's at random.

The training at UMD is not required, but it is free to students, faculty, and those who live near the campus.