Seven mountain rescue teams and a dog search team are now involved in trying to find the missing helicopter from Milton Keynes.
Bletchley Nat West Robbed Today
Thames Valley Police is releasing CCTV images of a man it would like to speak to in relation to a robbery at a bank today (12/1).
Shortly after midday, an offender walked into Natwest in Queensway, Bletchley, and threatened staff behind the counter.
He said he had a knife but no weapon was seen.
The cashier handed the man a sum of cash and he left the bank.
The man in the images is white and wearing a dark suit with a white shirt and red tie. He is wearing glasses.
Man wanted in connection with bank robberyInvestigating officer Det Sgt Phil Turner-Robson from Milton Keynes CID said: "This was a robbery in a bank at a time when there were a number of customers in the bank and in the immediate vicinity. Although staff were left shaken by the incident, the offender did not use any force and so no one was hurt.
If you witnessed the incident or know who the man in these images is, then please let us know."
Anyone with information is asked to contact Det Sgt Turner-Robson on 101.
If you don't want to speak directly to the police you can contact the independent charity Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org. No personal details are taken, information is not traced or recorded and you will not go to court.
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