Homestead High School canceled after-school activities on Tuesday, Oct. 25, to conduct a search after a student found a note stating "Bomb @ 4:20," but nothing was found.
Law enforcement completed an exterior sweep of the campus while school personnel did a sweep of the interior.
The Milwaukee County Sheriff's Office K-9 unit was brought in that evening to do an additional security sweep of the campus, said Jennifer Flierl, executive director of communications for the Mequon-Thiensville School District.
"We are pleased to report that canine search did not result in the discovery of anything irregular," Flierl said.
Classes were set to resume as scheduled on Wednesday, Oct. 26.
Concerns were raised when a student saw the note written on the inside of a bathroom stall at approximately 11 a.m., according to a news release from the Mequon-Thiensville School District. It's unclear when the note was written.
After administrators consulted with local law enforcement, it was determined the incident didn't warrant immediate evacuation. Instead, after-school activities were canceled as a precaution to allow police to sweep within the school building.
Security camera footage was reviewed in an attempt to figure out who composed the note.
The release said administrators would continue to investigate the situation and "swift and significant discipline" would be given to the responsible individual or individuals.