A teenager who was stabbed to death in northwest London is believed to have first had a car driven at him and then been chased by four people before the fatal attack, police have said.
Sixteen-year-old Drekwon Patterson was found with stab injuries and given emergency treatment at a roadside before being taken to hospital on Thursday evening, but he died the following morning.
Scotland Yard have now released images of a car and a van they want to trace in relation to their investigation.
A black Ford Mondeo using registration number YR54 NHN was seen driving from the scene in Preston Road, Brent, shortly after 11.30pm on Thursday.
It was later discovered burnt out.
Investigators believe it was the car used to drive towards Drekwon, who was from the Wembley area.
Police are also keen to trace the driver of a van seen on CCTV stopping briefly near the scene, and are appealing for them to come forward as a witness.
No arrests have yet been made.
Officers are continuing to conduct additional patrols in the area, and local residents are urged to speak to them if they have any information or concerns.
Detective Chief Inspector Richard Leonard, from the Metropolitan Police, said: “I need to hear from any witnesses or anyone with information about this tragic murder – if you know anything that may be significant, please get in touch.
“In particular, I need to find out more information about a car – a black Ford Mondeo, – which was seen on CCTV driving away from the scene and found burnt out in Silver Jubilee Park, NW9 on 19 February.
“I believe this car was used in an initial attempt to injure Drekwon in a collision on Preston Road.
“After the Mondeo had been driven at him, Drekwon ran away and was chased by four suspects who had got out of the car, before being caught and fatally stabbed.”
He said the car is a “key line of inquiry” and described it as “a fairly large vehicle and quite old, so it would have been noticed”.
Anyone with any information is asked to call the incident room on 020 8721 4622 or call police on 101 quoting CAD 8167/18Feb. Alternatively, information can be given anonymously to Crimestoppers on 0800 555 111.