A member of staff at a bookmaker's has been threatened with a handgun during an armed robbery in Leighton Buzzard.
It happened on Saturday evening at Betfred in Wing Road.
The raider demanded money, which was handed over, before running from the store.
Detective Constable Rachel Foy, who is investigating the offence, said: "This was an extremely frightening attack and it is important that we catch this offender as soon as possible.
"The offender fled towards New Road but we believe that he may have made his way to Mentmore Park."
Two people have been arrested in relation to the raid and released on police bail pending further inquiries.