Hundreds of Kimberley students have been told to stay home today after a school and TAFE were trashed on the weekend.
Fitzroy Crossing's Sgt Andrew Stevens said Saturday night's vandalism had left broken glass strewn throughout Fitzroy Valley District High School.
More than 250 students have been given the day off as the mess is cleaned up.
"A group of offenders have forced the gate open and gone into the administration office by smashing a window," Sgt Stevens said. "Once inside, they've rummaged through desks and set off fire extinguishers around the building.
"They've gone to the (design and technology) building, found a supply of hammers then gone around the rooms with those hammers smashing windows to get inside.
"They then went to the TAFE next door and once again smashed entry into the rooms, rummaged through desks and threw property around."
Sgt Stevens said he had lost count of how many windows were smashed but the attack must have caused more than $10,000 damage.
The offenders also tried to steal two cars but could not start them.
"The school's closed today because it's not really safe for the kids to be there with all that glass," he said. "It has happened before, but it's quite rare and we're working a lot with families to prevent it.
"We've identified some persons of interest and we'll be chasing them up today."
The school is expected to re-open tomorrow.
Anyone with information is asked to call Crime Stoppers on 1800 333 000.