More than 100 doors at a Simi Valley high school were glued shut in a prank that authorities described Wednesday as "felony-level vandalism."
Faculty at Royal High School discovered the vandalism as they arrived on the campus around 6:30 a.m.
Nearly a dozen school employees feverishly worked to clean the industrial-strength glue from locks so students could get to their first-period classes, said Michael Clear, assistant superintendent of business and facilities for the Simi Valley Unified School District.
After squirting the glue into the locks, the pranksters also stuck pennies to the outside of the locks to make sure the liquid dried in place, Clear said.
Clear said a precise damage estimate was not immediately known because school and district officials were still trying to determine how many locks would have to be replaced.
"There are harmless pranks and then there are pranks like this which are very expensive to fix," Clear said.