A gang armed with batons and a kitchen knife have escaped with cash after threatening staff at a betting shop in Codsall, near Wolverhampton.
Staffordshire Police said three masked men were involved in the raid at the William Hill bookmakers in the Lane Green shopping parade.
A police spokesman said: "Two of the offenders jumped over the counter and threatened staff, one of whom was ordered to open the safe at knifepoint.
"The safe could not be opened but a quantity of cash was stolen from the tills before the men escaped."
Two female staff and two customers were in the shop at the time of the robbery at around 8.40pm last Thursday.
Anyone with information is asked to call Staffordshire Police on 0300 123 4455 or the Crimestoppers hotline on 0800 555111.