Police have released further CCTV images following a robbery at Coral bookmakers in Bedford Road, Kempston, on Friday, October 16.
At around 9.45pm, two shop workers were threatened with a knife before the offender made off with cash from the tills.
Officers are keen to speak to the two men pictured as they believe they may have information which could assist their enquiries into the incident.
Call PC Ben Stone, investigating, on 101 with information. Alternatively, contact Crimestoppers, anonymously, on 0800 555 111.