(CNN) — Police are responding to a report of an active shooter at Villanova University in Pennsylvania, according a post by the Radnor Township Police Department on its Facebook page .

All nearby residents and students are being asked to shelter in place.

People on campus are also being asked to stay clear of the law school’s Scarpa Hall, move to a secure location and to lock or barricade doors, the university posted on its website .

Law enforcement is conducting a sweep of the law school for any victims or a suspect, but the exact nature of the incident is still unclear, according to a law enforcement source.

Armed police officers could be seen from the roof as dozens of law enforcement and fire officials responded to the campus, video from CNN affiliate WPVI showed.

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