The same man is believed to be responsible for two armed raids on shops in Leicestershire.
A robber took cash and cigarettes after threatening the shopkeeper at Mark Convenience store in Thurmaston with a suspected firearm on Wednesday.
The following day, a worker at Wanlip Store in Birstall was also threatened with what is believed to have been a gun, but the man left empty handed.
In both cases the victims were unhurt, but "extremely shocked and shaken".
During the first robbery, on Melton Road at 2150 GMT, the suspect wore a pale pink hooded top, dark jogging bottoms and a balaclava.
In the second, on Wanlip Lane at 1040 GMT, he was wearing a dark navy blue hooded top over a pink top and had his face covered.
The robber is described as between 5ft 5in (1.6m) and 5ft 7in (1.7m) tall and of slim build.
Det Con Sean Lynch from Leicestershire Police said: "If there is anyone who saw this man after either of these robberies or knows who he may be, we would urge them to contact police.
"Even the smallest of information you have may be useful to our enquiries."