Detectives investigating an altercation in Bristol city centre in which a man was assaulted are appealing for witnesses to come forward. A white man, aged in his early twenties, of medium build and with short brown hair. He was wearing a black t-shirt with a large white motif on the front, dark-coloured work shorts, and white trainers. A white man, aged in his early twenties with brown hair and a beard. He was wearing a black t-shirt, work-style shorts, and dark trainers.