The bus was travelling on Chalmers Street at the time of the incident.
A YOUTH threw an object at a moving bus from a train station platform in Clydebank, according to police.
Officers are making enquiries into the incident of culpable and reckless behaviour on Chalmers Street which they say saw the nearside rear window of the bus smashed.
The incident occurred around 7.45pm on May 7 and anyone with information can contact police on 101, citing incident number 3622 of May 7.
Alternatively, witnesses can contact Crimestoppers on 0800 555 111.
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