North Yorkshire Police today said an "incident" took place Mrs Lofthouses Book Emporium on Queen Street on Sunday, October 8.
At around 2.45pm "an incident occured which involved a man who had entered the shop with a quantity of books and a member of staff," police said.
The force gave no more details.
Anyone with information is asked to call 101 and ask for Jade Gallagher-Barrass. People can also email [email protected]
Quote the North Yorkshire Police reference number 12170180608.