The thieves used a red Land Rover, stolen from Cambridge on Sunday to ram their way into the Visitor Centre at around 1.40am before driving off in another vehicle, believed to be an Alfa Romeo. The three men, dressed in black and wearing balaclavas, left the Land Rover and the ATM but nothing was stolen. They drove towards Royston. Detective Sergeant Sarah Gaylor said: I would urge anyone who saw either of these vehicles prior to the raid, or the Alfa Romeo afterwards, to call police. I have a team of officers investigating this incident and CCTV is being reviewed to try and find the offenders who did this. Forensic examinations are taking place at the Visitor Centre and on the vehicle, but I am keen to hear from anyone who saw anything suspicious in the area leading up to the incident. INFORMATION: Anyone with any information should call DS Gaylor on 101 or Crimestoppers, anonymously, on 0800 555 111.