Staff were threatened by a masked man with a knife during an allegedly robbery at a convenience store in Lincoln.
The man entered the West End food store on West Parade at around 3.30pm on Thursday, January 31 before stealing cash.
Nobody was injured in the incident.
Lincolnshire Police said: “The offender is described as slim build, wearing a grey balaclava and grey jacket.
“He threatened staff with a knife at around 3.30 pm before leaving with a small amount of cash.”
Anyone with information should contact police on 101 quoting incident number 242 of January 31.