Detectives are hunting a group of four masked men who robbed a busy McDonald's restaurant in Smethwick on Monday night.
A group of men walked into the Cape Hill branch on Grove Lane at around 5.15pm and forced their way through to a back office while a cash collection was taking place.
The men, armed with a crowbar and an axe, threatened staff before escaping with a large amount of cash.
No one was injured during the incident.
Detective constable Simon Pittaway, from the Sandwell and Dudley team of Force CID, said: "The nature of this robbery suggests that the offenders had been in the area some time before striking, as they quickly arrived at the scene just as the cash collection was being made.
"They had the nerve to enter a restaurant at teatime, when it would have been full of people.
"As a result, there must be several people who witnessed them arriving at the scene, the robbery taking place, and then the offenders leaving the area.
"We urge them to come forward and tell us what they know to help with our investigation."
The men are known to have used a small to medium sized black car, bearing false registration plates. The men all wore scarves or bandanas across their faces and wearing black jackets.
Anyone with information to help the police investigation is urged to contact CID at Harborne police station on 0345 113 5000 or speak to Crimestoppers anonymously on 0800 555 111.