A minutes silence followed by the ringing of 26 bells was heard in Newtown, Connecticut, one week after a gunman broke into Sandy Hook Elementary school and shot 20 young children and six of their teachers.
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The shocking video of Laquan McDonald being killed brings the debate about racism in the US criminal justice system centre stage once more.
A video of a white police officer shooting dead a black teenager has been released by authorities in Chicago.
Cold in the wind