Detective Chief Inspector Mark Wrigley, who leads the investigation, said: “We have arrested five people and continue to make good progress, but it is clear that there were more people who witnessed Sven’s murder.
“If you were in Willesden Lane at around 5.40pm on Saturday, 6 February and saw anything, however insignificant you think it might be, I’d like you to get in touch and tell us what you saw.