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Ohio State University looking southeast from the stadium toward the medical complexes. Ohio State University is telling students that there's an active shooter on campus and they should "Run Hide Fight."

COLUMBUS, Ohio (AP) — Ohio State University sent a series of tweets Monday morning warning of an active shooter on campus, telling students to shelter in place and to "Run Hide Fight."

Around 10 a.m., the university's emergency management department tweeted "Buckeye Alert: Active Shooter on campus. Run Hide Fight. Watts Hall. 19th and College." Watts Hall is a materials science and engineering building.

Follow the live tweets from Ohio below:

"Run, hide, fight" is standard protocol for active shooter situations. It means: Run, evacuate if possible; Hide, get silently out of view; or Fight, as a last resort, take action to disrupt or incapacitate the shooter if your life is in imminent danger.

The university followed up with another tweet: "Continue to shelter in place in north campus area. Follow directions of Police on scene."

The Columbus Police Department referred calls to Ohio State. A dispatcher for Ohio State police declined to comment. The media relations office said it wasn't immediately able to comment.

Many police vehicles were at the scene. No other information was immediately available.

With nearly 60,000 students at its main Columbus campus, Ohio State is one of the nation's largest universities.