Activists in Chicago city of US demand to bring changea in police culture to tackle killings of black youths by officers.
The organisers thought they’d attract a bigger crowd. The police prepared for thousands.
But with a chill wind whipping off Lake Michigan, driving the rain into the faces of demonstrators, it was still an impressive turnout.
In just three days, church groups, trade unions and community organisations turned hundreds and hundreds on to the streets.
It was the biggest protest so far in Chicago, marking the death of Laquan McDonald.
Thirteen months ago the black 17-year-old was shot dead by police.