Steve Cooper from Boston's 7 News, Fox News' Sharman Sacchetti and WCVB's Sean Kelly have tweeted:
He turned back to see his family and smiled a bit
Tsarnaev just turned his head to smirk at family.
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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