Police were called to a shop on Whitham Road, Sheffield on Friday, following the report of an armed robbery.
The robbery took place just before 8.40pm when a man walked into the BetFred store and is believed to have been carrying a gun.
He is then alleged to have made threats to staff and approximately £500 was stolen.
The man is reported to have left the scene on a scooter with another man.
No one was injured during the incident and no shots were fired.
Mark Pearson, spokesman for BetFred, told The Star: “Obviously we take this matter very seriously, the safety of our staff and customers is paramount to us and we will be cooperating with the police in their investigation.”
Enquiries are ongoing by detectives and anyone with any information is urged to contact South Yorkshire Police on 101 quoting incident 1133 of 6 December. Alternatively call Crimestoppers anonymously on 0800 555 111.