UPDATE

BELLEVUE, Iowa -- Students at Bellevue Middle/High School were evacuated for a little more than one hour today after a student found a threat written in a bathroom. 

School officials announced via social media that they were evacuating the building at about 10:55 a.m. Law enforcement then completed a sweep of the building and found no safety risks. 

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"After a thorough search with law enforcement, the building and surrounding area has been deemed safe to return," Superintendent Tom Meyer announced at about 12:15 p.m. 

Meyer said the threat was discovered by a student, who reported it to staff. He would not comment on the nature of the threat, other than specifying it was found in a school bathroom.