Tucson Police are investigating a case of vandalism after 11 school buses were found with broken windshields and body damage Monday morning.

The damage, described as “substantial" by the Tucson Police Department, was done with large rocks thrown over a fence. As a result, student pick ups were delayed for Collier Elementary and Sabino High schools.

Police were called to the TUSD's east side transportation center in the 9200 block of East Broadway, near Harrison Road, Monday morning. A timeframe for when the vandalism occurred has not been established.

Many of the buses were repaired Monday morning and more were expected to be back on the road by the time school let out, TUSD said in a news release. 

The transportation center has surveillance cameras but it was unclear Monday if the incident was caught on tape, said Sgt. Chris Widmer, a TPD spokesman. No arrests have been made.

A damage estimate was not available Monday. Anyone with information is asked to call TUSD's School Safety anonymous tip line at 584-7680.

Contact reporter Alexis Huicochea at ahuicochea@azstarnet.com or 573-4175. On Twitter @AlexisHuicochea

Education writer for #ThisIsTucson. Mom of one.