One injured after a bus crashed into several parked cars in a collision at 21st Street and Market Street in San Diego, California

Police responded to calls about the collision at 21st and Market streets around 5:18 p.m. The driver, thinking the bus was parked, was trying to get the mobility aid ramp down when the bus started rolling away and crashed into the vehicles and a tree, Officer John Buttle with the San Diego Police Department said.