Detectives have released these images of two men they want to trace following an attempted robbery at a bookmakers.
The incident happened at the shop on Keighley Road, Ovenden, on Saturday Auagust 11.
Two men wearing balaclavas entered at about 8.50pm and demanded money.
They left empty handed after staff threatened to ring the police and no one was hurt.
One of the suspects was wearing a khaki or beige coloured hooded jacket with pockets across the chest and a motif on the left sleeve.
Anyone who witnessed the incident or has any information about those involved is asked to call DC Rebecca Lawrence in Calderdale CID on 01422 337086 or 101.