( CNN ) -- The University of Oklahoma in Norman briefly shut down Wednesday after a report of a possible shooting that apparently turned out to be a false alarm , the university 's president said . `` At this time , there is no evidence that shots were fired . Classes are going on as normal in all other buildings except Gould Hall , '' President David Boren said Wednesday afternoon . `` Additional search of Gould Hall being conducted just in case . It appears to have been a false alarm . '' Earlier Wednesday , no evidence had been found of any shots being fired , and no injuries had been reported , school spokeswoman Catherine Bishop said . After telling students to take shelter for more than 30 minutes , the school later announced that normal campus operations had resumed -- except at Gould Hall , the site of the reported shooting , `` where additional checking is continuing , '' the school tweeted . Gould Hall houses the university 's College of Architecture . Both the Norman and campus police responded quickly as did emergency personnel , the school tweeted . Boren told students the incident may have been a false alarm caused by a machinery backfire , independent student newspaper The Oklahoma Daily reported on Twitter . Maj. Bruce Chan of campus police told CNN there was a report of shots fired in the Gould Hall area of campus . The incident took place at around 11:20 a.m. local time ( 12:20 p.m . ET ) while classes were in session . Students and faculty were alerted via text . On Tuesday , a gunman shot and killed a man at Purdue University in Indiana . CNN 's Sara Pratley and Mayra Cuevas contributed to this report .
Incident : University president calls incident ` ` a false alarm '' The backfire may be behind incident , ' newspaper reports . Normal campus operations resume except at Residence Hall . Earlier , students were forced to take shelter .