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The images of two men are from footage taken on Sunday 4 August.
As part of Cleveland Police’s investigation – codenamed Operation Acorn – and led by dedicated detectives in the Homicide and Major Enquiry Team (HMET) they are seeking to identify all the individuals.
If you recognise the people in the photos, please get in touch either by calling 101 quoting reference number 148284 or visiting a website set up for the investigation.
Information can also be provided anonymously by calling Crimestoppers on 0800 555 111 or via their website.
When reporting information please quote the number on the image.