A bus driver was verbally and physically abused by two men at the bus depot in Skircoat Moor Road, Halifax, yesterday (Thursday) at 6.15am.
One man was arrested at the scene.
But the second man fled.
He is described as a white male, between 17 and 20-years-old and was wearing blue jeans and a white top. He had dark hair.
Anyone with any information or who witnessed the incident is asked to contact police on 101 or via Crimestoppers, anonymously on 0800 555111.