Staff at a Wigan takeaway were threatened by a masked raider wielding "a gun in a plastic bag".
Police have released footage of the attempted armed robbery at the shop in Atherton.
At around 8.45pm on Saturday February 11, police were called to reports that a man had entered the shop on Leigh Road, Howe Bridge, and threatened staff with a concealed weapon.
The offender pointed what appeared to be a gun wrapped in a plastic bag at the staff behind the counter, demanding that they open the till, police said.
He attempted to draw another weapon from his pocket, before fleeing onto Leigh Road and towards Riley Street.
The man is described as white, around 6ft tall and of slim build. He was wearing a blue jumper with a black hooded jacket underneath and had black material covering most of his face.
Officers have released CCTV footage in a bid to identify a man they want to speak to in connection with the incident.
Detective Sergeant David Johnston, of GMP’s Wigan Borough, said: “I am appealing for information about this terrifying incident, which has put these people’s safety in danger, all for petty cash from a till.
“If anyone recognises the man in the CCTV footage or has any other information that may help us then I urge you to get in touch.”
Anyone with information should contact police on 0161 856 7292 or the independent charity Crimestoppers, anonymously, on 0800 555 111.