Sussex Police are appealing for witnesses following an armed robbery near Chichester.
A man entered the Co-op store in Malcolm Road, Tangmere around 10.10pm on Tuesday (January 8) and threatened staff members with a knife.
The man stole a quantity of money from the till and fled the store.
He was described as wearing a light blue coloured hooded top with the hood up, light grey jogging bottoms, black trainers, black gloves and something covering his face.
Detective Sergeant Graham Leaney said: “This happened late in the evening when the suspect knew there would be limited people around.
“The staff have, understandably, been left very shaken by this incident and support is being provided.
“We would like to speak to anyone who may have witnessed the suspect either entering or leaving the store.”
You can report information either online or by calling 101 quoting 1298 of 08/01. Alternatively, you can visit the Crimestoppers website or contact the independent charity anonymously on 0800 555 111.