The incident took place over the festive period last year.
The hunt's on to find a man suspected of punching a Chesterfield bus driver in the face.
It happened on Christmas Eve last year on the 49 service.
The vehicle was preparing to set off from Clay Cross bus station-when a man ran in front of the vehicle, before going on to assault the driver.
Officers are appealing for the public’s help in identifying a man they want to speak to in connection with the assault of a bus driver in #ClayCross. Do you recognise him? https://t.co/hb5JHGhL0Q pic.twitter.com/2juULt9e9B— Derbyshire Police (@DerbysPolice) March 28, 2019