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The UCLA campus was placed on lockdown today amid reports of a possible shooter in a campus engineering building.

Los Angeles police Officer Aareon Jefferson said there may be two shooting victims, but there has been no confirmation.

The shooting was reported shortly before 10 a.m. in Boelter Hall, which is part of the Samueli School of Engineering and Applied Science, according to the university.

The entire campus was placed on lockdown and students were advised to shelter in place. A large number of police and fire units swarmed to the Westwood campus, and paramedics were seen standing by with gurneys.

The Los Angeles Police Department went on a tactical alert in response to the shooting reports.

The Daily Bruin, the UCLA campus newspaper, reported via Twitter that “many professors (are) being asked by administrators to cancel classes in the next few hours and email students.”

Fairburn and Warner elementary schools and Emerson Middle School, all of which are located near the campus, were placed on lockdown, according to the Los Angeles Unified School District.