Police are appealing for information after a quantity of cash was taken from a woman in Spring Gardens, Buxton, on Monday.
The victim had just withdrawn a considerable amount of money from the bank when the theft happened.
Two female offenders targeted her and followed her into a shop where they took an envelope containing the cash.
Inspector Martin Coey, who is in charge of policing in Buxton, said the women had probably come to Buxton from outside the area.
He added: “Buxton is a safe place but sometimes we get people coming in from out of the area to commit crime.
“If you are withdrawing large sums of money from the bank, go with someone else and be aware because people might be watching you.”
The theft happened at approximately 1.30pm.
The women are described as being white, in their early 20s and around five foot six.
The first had long hair worn loose and was wearing a dark hooded jacked, jeans, a black and white spotted scarf and was carrying a large shoulder bag.
The second had brown hair tied up and was wearing dark trousers, a green/blue jacket and carrying a shoulder bag.
Anyone with information is asked to contact police on 101.
Alternatively, contact Crimestoppers anonymously on 0800 555 111.