DETECTIVES have issued dramatic CCTV stills of an armed robbery at a petrol station during which staff were threatened by a man with a knife.

Cash was taken from the Texaco Service Station, Elton Head Road, Sutton Heath at 10.25pm on Thursday, December 21, 2006.

Police say two men had entered the petrol station and the man pictured is alleged to have threatened staff with a large knife.

Anyone with information regarding the robbery can contact the CCTV Unit at St Helens Police Station on 0151 777 6087 or Crimestoppers, anonymously, on 0800 555 111 quoting Reference Number 9674.