Police were called after reports of an attempted robbery at the Ramco shop in Northampton Road just before 9.15pm last night (Monday).
Two men entered the shop and threatened staff with a knife before being challenged by shop workers and making off.
Nothing was taken and no-one was injured in the incident, but a police spokesman said there were a number of customers in the shop at the time.
An investigation has been launched and police are asking for any witnesses to contect them on 101 or Crimestoppers anonymously on 0800 555111.