Investigators have remained mum on any potential leads . University has received five bomb threats since March 30 . Justice Department group says it began sending threats February . Group tells student paper that it will stop sending threats . University is confining final exams to 140 buildings .
University has received five bomb threats since March 30 . Justice Department group says it began sending threats February . Group tells student paper that it will stop sending threats . University is confining final exams to 140 buildings .