Robbers threatened victims with knives
In the first robbery, at 9.30pm last Wednesday, a man was threatened by two men who produced a knife and demanded his wallet in an ambush in Fir Road.
Both robbers had their faces covered.
One was over 6ft tall and was wearing a dark sweater, grey tracksuit bottoms and gloves.
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Hide AdThe other was about 5ins tall and was wearing similar clothing and gloves.
The following day a convenience store in Ravencar Road was raided by two men who threatened the assistant with a knife.
They stole money from the till and chocolate on display in the shop.
One man was white, around 6ft tall and in his mid to late twenties.
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Hide AdHe had the lower part of his face covered, was wearing a blue T-shirt and light brown trousers and was carrying a black rucksack.
Anyone with information should call Detective Constables Julian Hall or Jo-Anne Webster at Derbyshire Police on 101.