South Yorkshire Police said he held up a shop in Malin Bridge.
No other details have yet been released.
A force spokesman said: "A single male was involved. Enquiries are ongoing."
Robber struck at shop in Sheffield suburb
A hunt is underway for a robber who struck at a shop in a Sheffield suburb.
By The Newsroom
Monday, 13th February 2017, 11:44 am
Updated Tuesday, 28th February 2017, 11:45 am