The incident took place at Coral in London Road, Kettering, at about 8.20pm yesterday (Monday). One of the offenders, who had a grey face covering, jumped over the counter and demanded money. A second offender stood in the shop, close to the counter with a large, black coloured, wooden handled knife. A third offender stood in the doorway of the shop. Cash was stolen and nobody was hurt. The offenders ran out of the store and turned left down Silverwood Road. Anyone with information should contact police on 101 or Crimestoppers anonymously on 0800 555111.