Armed robbers tried to smash the counter glass at a post office during a raid on Tuesday (December 3).
The two men, both wearing balaclavas and armed with a sledge hammer entered Potton Post Office in Brook End at around 4.45pm and demanded that staff hand over money.
They attempted to smash the protective glass and a security door before leaving empty-handed.
It is believed they escaped in a blue Seat Toledo car, registration RO02 DKN which was later found on fire in Sutton Road, Biggleswade.
The first robber is described as white, between 5 ft 6 in and 5 ft 8 in tall with a stocky build and wearing a black ribbed balaclava with a white band along the bottom. He may also have been wearing a boiler suit or a shiny black jacket.
His accomplice is also described as white and of slim build, wearing dark clothing and a black balaclava.
The officer in charge of the investigation, Detective Constable Luke Moore of Beds Police is keen to trace anyone who saw the blue car parked outside the post office or anyone who saw the car in Sutton Road, Biggleswade.
Det Con Moore said: “This was a terrifying experience for the people in the post office to have experienced and I would urge anyone with information relating to those responsible to contact the police.
“It is possible that local residents in Potton may have noticed a blue car outside the post office earlier in the day or members of the public may have seen the car being abandoned in Sutton Road.
“These people may have vital information relating to the identity of the offenders and I would also encourage these people to speak with officers, in complete confidence.”
Anyone with any information can contact Det Con Moore, in confidence, at Luton Police Station, on 01234 275011, Bedfordshire Police on 101, or text information to 07786 200011.
Alternatively, contact the independent crime fighting charity Crimestoppers, anonymously, on 0800 555 111.