A man wanted by police over a fatal stabbing is now believed to be in Devon or Cornwall.

Officers have been working to trace 33-year-old Kamar Williams after the stabbing in Stoke Newington on the evening of July 30.

Bus driver Derek Neil Thomas, 53, died after the attack in Northwold Road.

The last sighting of Williams, who lives in Isle of Dogs, was on August 3, when police attempted to stop a car in south east London.

Officers acting on intelligence approached the car on foot in Westbourne Avenue at the junction with Burnt Ash Hill.

The car immediately drove off, colliding with other vehicles. A number of people were reported to have sustained minor injuries.

Williams got out of the car and fled the scene but a woman was arrested.

It is believed that the 33-year-old sustained a leg injury in the incident, for which he has since received hospital treatment.

Police now believe that Williams is in Devon or Cornwall, having been traced to the Camborne area.

Detective Chief Inspector Mark Rogers said: “I urge any local people who see Williams to call 999 immediately. Do not approach him.

“If you have information as to his whereabouts, call us immediately.

“Kamar, if you are reading this – do the right thing and go to a police station immediately.

“There are scores of officers out looking for you and dozens of others working behind the scenes, and that is not going to change until you are in custody.

“We still believe Williams is being helped with transport and accommodation.

“I have to reiterate again that anyone working to frustrate our enquiries can expect to find themselves in very serious trouble that could end up with them going to prison.

“Think long and carefully about whether that is something you want.”

A 30-year-old woman was arrested on August 3 on suspicion of assisting an offender and taken into custody. She was later released on bail.

Anyone with information that could assist police is asked to call the incident room on 020 8345 3715, 101 or ‘X’ @MetCC and quote CAD 8517/30Jul.

You can also provide information, completely anonymously, to the independent charity Crimestoppers on 0800 555 111.