Teen faces 13 felonies for sex assault on school bus

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SURPRISE -- A teenager accused of sexually assaulting a young child on their school bus is facing 13 felony counts.

Investigators say three surveillance cameras on the bus captured the sex acts back in March.

A 14-year-old student at Sonoran Heights Elementary School is accused of sexually assaulting a first-grader at Cimarron Springs Elementary on March 20.

Police say the accused boy has "diminished developmental capacities."

The teen has not been identified because he's a juvenile.

The bus driver denied knowing anything about the alleged assault.

The Dysart Unified School District now makes students riding the bus sit with their own age groups.