Police have released a CCTV image of a group of boys who may have been at a Whaley Bridge store around the time a member of staff was assaulted there.
It happened at around 1.50pm on Wednesday 7 October at B&M Bridgemont on Buxton Road.
The female staff member was punched after trying to stop someone they thought had been trying to steal alcohol.
Police believe the boys pictured may have information which could help with enquiries.
Anyone who recognises them or can help is asked to get in touch, using one of the following non-emergency contact methods - quoting reference number 20*528102 and the name of the officer in the case, PC Gareth Podmore, in any correspondence.
• Facebook – send a private message to /DerbyshireConstabulary
• Twitter – direct message the contact centre on @DerPolContact
• Website – complete the online contact form https://bit.ly/2a5L5jj.
• Phone – call 101.
You can also call Crimestoppers anonymously on 0800 555 111.