Graphic images have been released by police investigating a robbery in Kempston in Bedfordshire last week.
They show the injuries suffered by the 45 year old shop worker, who was left with facial injuries after being assaulted by the burglar.
The attack happened at the One Stop shop in Hillgrounds on January 31st, when a man entered the back door of the store before taking money from the safe.
The raider is described as being around 6ft tall and wearing a black woolly hat, with a dark scarf and dark jacket.
Two men have so far been arrested and subsequently bailed in connection with the investigation. However police are still trying to identify the man captured by the shop's CCTV footage.
Anybody with information is asked to call Bedfordshire Police on 101, or anonymously to Crimestoppers on 0800 555 111.