Police Scotland is appealing to the public for any information they have which could help trace Donald Stewart Snr, 47 and Donald Stewart Jnr, 24.
Both men urgently require to be traced in order to assist police with their investigations into a serious incident which took place in Inverness on Sunday, August 19, 2018.
Both men are primarily based in the Highland and Moray areas. However, it is believed they may also travel further through Scotland and the wider UK.
Donald Stewart Snr is described as being white European, approximately 5ft 11in tall, with fair/blonde hair cut very short. He has tattoos on his right arm including 'Kelly,' a heart scroll and an image of a devil.
Donald Stewart Jnr is described as being 24 years old with fair/red hair, a thin build and psoriasis patches on his face.
Both are known as by the nickname "Blocker".
Detective Inspector Eddie Ross said: "Significant police enquiries have been carried out in relation to this incident and in an effort to trace the two men.
“I would ask people not approach either man if you believe you have seen them. Instead please call Police Scotland as soon as you can."
Anyone with information can contact Police Scotland on 101, quoting NN9222/18. You can also pass information anonymously to Crimestoppers on 0800 555 111.