An 18-year-old man is in a life-threatening condition after being shot outside a bar in Wembley in the early hours of Sunday, 21 September.
The incident took place on South Way, near Wembley Stadium, prompting a major police response. The road remains closed with a large cordon in place as officers continue their investigation.
The Metropolitan Police confirmed no arrests have yet been made. Detectives are appealing for witnesses and information.
A spokesperson said: “Enquiries are ongoing and we are urging anyone who saw or heard anything suspicious to come forward.”
Anyone with information is asked to call police on 101 quoting CAD 1343/21SEP, or to contact Crimestoppers anonymously on 0800 555 111.