Detectives investigating the murder of 20-year-old Romario Green in Brent have renewed their appeal for information.
They are particularly keen to speak to anyone who saw a distinctive light-coloured Ford Focus in the area near Wembley on the night of the shooting. They say the car had blacked out rear windows and large '21-spoke' alloy wheels.
Mr Green was pronounced dead at the scene after being found by paramedics just after midnight last Thursday, July 2, outside The Swan pub in Harrow Road, Sudbury Town.
A post-mortem examination at Northwick Park Hospital on Saturday gave the cause of death as a gunshot wound to the chest.
Detective Inspector Julie Willats, from the Met's Homicide and Major Crime Command, said: "The motive for this murder is unclear at this stage, but we are pursuing a number of lines of inquiry and are appealing to the public for information.
"We would like speak to anyone who may have been in the Harrow Road, Saunderton Road, Fishers Way and Williams Way areas between 10pm on Wednesday, July 1 and 1am on Thursday, July 2.
"We are particularly keen to speak with anyone who saw a light coloured Ford Focus driving around the area at the time or prior to the incident. The vehicle was distinctive in that it had blacked out rear windows and large '21-spoke' alloy wheels. If you know anything about this vehicle or the occupants then please get in touch as soon as possible.
"I would like to reassure any potential witnesses who may be worried about making contact that the Homicide and Major Crime Command have extensive expertise in protecting witnesses, and information will be treated confidentially.
"This is a very sad incident and police are committed to working with the community, local authority and other partners to keep people safe. The Safer Neighbourhoods teams will be speaking with local residents as part of this appeal."
Anyone with information is asked to call police on 020 8358 0100, or, if they wish to remain anonymous, Crimestoppers on 0800 555 111.
There have been no arrests and police enquiries continue.