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WARNING: The video contains very strong language.

Killings in Chicago have hit a 20-year high as the grim toll for homicides in the city passed 500.

A deadly summer of violence ended with multiple murders over the Labor Day holiday weekend.

Most of the victims - and the killers - are young black men. The BBC's Ian Pannell explores a world where gangs and guns rule.

Camera/director: Darren Conway; video editor: David Botti; assistant producer Gabriella O'Donnell; aerial photography Phil Jorden; executive producers Jacky Martens and Ben Bevington