Police hunting an armed robber have released a CCTV image of a suspect.
Detective Constable Jonathan Sainsbury, of Bournemouth and Poole CID, said: “This was a very distressing incident for the member of staff.
"I am releasing a CCTV image of a man who may be able to help us with our investigation.
“I would urge the man pictured – and anyone who recognises him – to contact Dorset Police, in confidence, as soon as possible.
“Anyone who witnessed this incident or has information about the man responsible should call police urgently.”
Witnesses and anyone with information should call Dorset Police in confidence on 101 quoting incident number 05:492.