Staff were forced to lock themselves in an office when armed robbers raided a Leeds betting shop.
Two masked men - one armed with a wheelbrace - entered Betfred, in Swarcliffe Parade, Swarcliffe, at about 8.20pm on Tuesday.
They threatened a female member of staff behind the counter and started to hit the security screen with the weapon, prompting the woman and a male colleague to lock themselves in a back room.
The robbers took cash from the the tills and stole a purse before running off.
Detective Inspector Paul Hobson, of Leeds CID, said: "This was a frightening experience for the staff involved and they were left understandably shaken by what happened.
"We would like to hear from anyone who witnessed the incident or who has any information that could assist the investigation."
Anyone with information is asked to contact Leeds District CID at Elland Road via 101 or call the independent charity Crimestoppers anonymously on 0800 555 111.