Several projectiles smashed a window of an Eggins bus on Wednesday, May 17.
The bus was travelling along Bushland Drive where two large rocks were thrown through a side window at 5.15 pm.
A smaller rock was thrown at the front of the bus, cracking the windscreen.
Two people were on board the bus at the time and were not injured.
The company confirmed the bus route will be modified following the incident.
All other routes through the area will remain unchanged.