Hundreds of protesters have gathered outside Tottenham police station to hold a vigil for Mark Duggan.
His relatives and supporters have called for the event to remain peaceful, while the Metropolitan Police warned that some protesters planned to "cause disorder".
The vigil is being staged in protest against what his family have branded a "perverse" inquest finding this week that Mr Duggan, 29, was lawfully killed by police.
Mr Duggan's mother Pamela and aunt Carole were joined by crowds carrying placards which read "Justice for Mark Duggan - 1476 deaths in custody or following police contact since 1990 not one conviction".
His death at the hands of a Metropolitan Police marksman sparked riots across the country in 2011.
Reggae and hip hop music was played from loud speakers as the family of Sean Rigg, a black musician who died in Brixton police station, joined the march.
Trade unionists were also present, while Tottenham Hotspur fans went past the protest to their home game against Crystal Palace at nearby White Hart Lane.