The victim, believed to be a 17-year-old, was found fatally injured at Brent Council's headquarters.
The attack happened on Tuesday afternoon at the headquarters of Brent Council in north-west London.
Alperton residents urge local authorities to stop weekly antisocial motorbike gatherings.
Home of Wembley Stadium, Brent is one of the most ethnically diverse local council areas in the UK.
Extra police were deployed to north-west London in week-long crackdown which led to over 40 arrests.
Brent Council apologises for the installation of the inaccurate sign, which is more than two years old.
Brent Council is to pay the boy's mother £1,000 for "avoidable frustration, time and trouble".
Campaigners for a community centre with significance for black British history lose a bid for it to have heritage protection.
The Greens now have representation on Brent Council, but Labour still retain political control.
