Police are trying to track down this man as they investigate an "unprovoked" attack on a 73-year-old man and his son. The elderly man was reportedly punched to the ground outside his home at around 3.30pm on Friday, September 12, on South View in Billingham.

When his son intervened, the suspect is said to have pulled out a knife and assaulted him, leaving him with a serious facial injury. The suspect, who was dressed in dark clothing, then made off from the scene. An investigation was launched and anyone with information is being urged to come forward.

The appeal from Cleveland Police states: "We’re asking for the public's help as officers continue to investigate an unprovoked violent attack in Billingham . We believe this man (pictured) may have information about the report and would

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