This is a breaking news story. Check back for updates.

UPDATE 12:24 p.m. EST: The Boston Globe, citing Massachusetts State Police, tweets that there was no gunman on the UMass-Boston campus.

"There is no threat. False report. Scene is clear," state police told the Globe.

Original story:

A building on the campus of UMass-Boston was evacuated Monday afternoon amid reports of a person with a firearm on the campus.

UMass-Boston sent out the following tweet about the incident from its Twitter account at 11:55 a.m. EST: