The robbery happened around 8pm on Saturday, December 10, at Coral Bookmakers in Roker Avenue. The offender went in to the store and threatened staff with a hammer, he made off with cash. It's believed the offender made of on a bike towards the Roker coast area and was wearing a black ski mask and padded jacket. Officers are carrying out inquiries and appealing for witnesses. Anyone with information should contact Northumbria Police on 101 quoting reference 1130 101216 or Crimestoppers anonymously on 0800 555 111.