Police arrested a 13-year-old at Shadow Ridge Middle School in Thorton, Colorado, on Monday after the campus received a bomb threat.

All staff and students were evacuated at around 11:10 am, local media reported, and bused to a different location. After a search, authorities found containers of a clear fluid that was determined to be ethanol alcohol.

The boy, who was not publicly identified, was taken into custody on a charge of interference with staff, faculty or students of an educational institution.