Police are investigating whether a Melbourne bus driver was shot in the head after an "object" shattered his windscreen and struck him.

Emergency services were called to Mount Waverley about 3.20pm on Tuesday after the driver, a man in his 60s, suffered a non-life threatening injury as he drove along his route.

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The incident took place right outside a primary school and photos show the windscreen shattered by the small object.

A bus driver was injured after an "object" shattered his windscreen while driving. Credit: 7NEWS

There were a number of passengers on the bus at the time.

The police Armed Crime Unit and ballistics police set up a crime scene to investigate whether it was a bullet.

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On Tuesday night, a second bus driver contacted 7NEWS, claiming his bus also came under attack in the area around the same time.

Police are calling on a number of passengers who left the bus to come forward as they continue their investigation.

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