COLUMBIA, Mo. – University Hospital in Columbia was locked down for more than two hours Thursday night.

Details about the lockdown were not being released, University Hospitaleven after the lockdown was lifted around 11:40 last night. One official said there was a concern about violence over a patient in the emergency room. Social media at the University was full of rumors about a gunman and other threats to the campus.

School officials issued a mass email to reassure students that they were safe.