A man armed with a hammer's stolen cash from a shop in Bicester.
Staff were also threatened in the robbery at Tesco Express in Holm Square on Wednesday night.
No one was injured during the incident.
Detectives want to question the man in these pictures about what happened.
Investigating officer Detective Constable Anneliese Palfrey, of Force CID based at Bicester police station, said: “We are appealing for information following this robbery and we have released CCTV images of a man we believe might have information in connection with this incident.
“We believe that shortly before the incident, at around 11pm, the offender hid behind a bin before going into the shop.
“We would ask anyone who has information or may have been passing by between 11pm and 11.10pm to please come forward."
If you have any information relating to this case, please call 101 quoting reference '1660 2/8/17', or contact Crimestoppers anonymously.