Law-enforcement officials are investigating two bomb threats found at Owosso Middle School in the same week.
The most recent threat was found written on a bathroom wall a nd was reported to school officials, but law enforcement officials again found no evidence of a bomb.
"Shortly after dismissal Thursday, a student reported to Assistant Principal Ed King that a bomb threat was written on a bathroom wall," a press release stated. "The threat indicated the location of the bomb and time it would go off. Law enforcement was immediately called to search the area. Law enforcement found no evidence of a bomb and gave the all clear."
The district superintendent says K9 units were called in to sniff for potential threats.
The Department of Homeland Security is investigating.
Parents were immediately notified of the threats.