Two elderly women were targeted by thieves who stole their purses while they were shopping.
The offenders struck at Morrisons, in Belper, between 1.15pm and 1.50pm, on Friday, February 13.
One of the victims was an 85-year-old woman from Belper and the other was an 84-year-old woman from Hulland Ward, near Ashbourne.
Police warned shoppers to keep their purses concealed and safely stored in zipped-up bags.
One of the victims told police she was approached by a man shortly before realising her purse had been stolen.
This suspect was described as white, aged in his 40s, 5ft 8ins tall and of stocky build.
Anyone with information is urged to call police on 101.