The mayor of Chicago has appealed for calm after the release of footage showing an unarmed boy aged 13 being shot dead by a policeman last month.
The video shows Adam Toledo with his hands up and with no weapon. The police film shows a handgun near the spot where he fell.
The teenager's death comes at a time of high tension in the US about police killings.
Reeta Chakrabarti presents BBC News at Ten reporting by Barbara Plett Usher in Chicago.
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