ORANGE ( — Chapman University’s Moulton Hall was evacuated Thursday after a possible pipe bomb was reported outside the building.

A suspicious package was found about 9 a.m. behind Waltmare Theatre, and campus officers who responded to the scene determined it was a possible pipe bomb, Chapman University spokeswoman Mary Platt said.

READ MORE: Día De Los Muertos Celebrations and Others Return To LA

Bomb squad investigators fired a round into it and when it didn’t explode, they declared it inert, Orange police Lt. Fred Lopez said. It’s possible the device was a prop from the theater, he said.

READ MORE: Sigma Nu Fraternity At USC Suspends Member At Center Of Sexual Assault Allegations

By 11 a.m., Moulton Hall was reopened and classes inside the building resumed, Platt said.

(©2015 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. Wire services contributed to this report.)

MORE NEWS: USC Places Sigma Nu Fraternity On Interim Suspension After Reports Of 'Possible Drug-Facilitated Sexual Assaults,' Students Protest In Support Of Victims