A man walked into the Halls Road store at around 7.55pm on Monday (14th April) and selected a can of drink before walking to the till. He then threatened a member of staff with a knife and demanded money.
The man is described as of large build and was wearing a light scarf over his face, a grey hood, dark black and grey striped top, blue trousers, black gloves and white shoes.
This incident is being linked to a robbery at the same store at around 2.30pm on Sunday 29th December when a man made off with a quantity of money after threatening a staff member with a knife.
Investigating officer Det Con Louise Macpherson said: “This was a frightening ordeal for the member of staff, who was forced to open the till after being threatened with a knife.
“We are linking this to a previous incident at the store due to a number of similarities between the two incidents.
“I believe someone will know who is responsible and I would urge them to come forward. Robberies often have a devastating impact on victims, especially when weapons are used.”
If you know who this man is, or have any information about either of the robberies, call South Gloucestershire CID on the 24-hour Police Inquiry Centre on 101.