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The alerted was issued Wednesday night.
Monmouth University in West Long Branch, New Jersey, has issued a shelter-in-place order due to a "possible armed subject."
Monmouth University Police received a report at 9:15 p.m. of a "possible armed subject" on campus, the school said in an alert posted to its website.
"Students should comply with the shelter-in-place order -- They should not leave campus, nor should anyone come to campus," the university said in its updated alert at 11:33 p.m. "Please leave police phone lines open for emergency calls."
Multiple local and county law enforcement agencies are searching and securing the campus, the university said.
This is a developing story. Please check back for updates.