Student were evacuated and the Mendota Police Department was called after a suspicious device was discovered Tuesday morning at Mendota High School.
The package was wrapped in red paper and had a note written in Spanish warning students.
The bomb squad responded and sprayed the suspicious device with a high-pressure water canon from a robot and discovered it was a block of wood and not a bomb.
Investigators are trying to determine who is responsible for the prank.
All classes were canceled following the evacuation.
Mendota High School was evacuated and classes canceled Tuesday morning because of a suspicious package.
CBS47 has a crew on the way and will bring you updates as soon as they become available.