A takeaway delivery rider was attacked with glass bottles at a junction in Northampton before robbers took his motorbike.
The 38-year-old victim was approaching the junction of Craven Street and Military Road in the Mounts, at about 9.40pm on Thursday, November 19, when he saw two men stood against the side of a building.
As he set off from the junction, one of the men grabbed at his bike and both men assaulted the rider, hitting him on the head with bottles and breaking his crash helmet.
The victim attempted to drive off on the bike, but was kicked off.
A police spokeswoman said and one of the alleged robbers then got on the bike and drove off.
A short time later the motorbike was involved in a crash at the junction of St Matthews Parade and Oakwood Road, Kingsley.
The two robbers were both men.
The man who rode off on the motorcycle was black, of thin build, around 5ft 8 ins, and in his late 20s. He wore jeans and a light-grey jacket with the hood up.
The second offender was white with a moustache, in his late 20s and about 5ft 9ins. He had short black hair and wore a red jacket.
Officers would like to speak to anyone who may have witnessed the robbery or the road traffic collision, which happened at about 10pm.
Witnesses of either incident or anyone who may have any information about them are asked to contact police on 101 or Crimestoppers anonymously on 0300 111 222.