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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Thousands of demonstrators have marched through Boston in opposition to a right-wing rally in the city which was eventually cut short.
Some 1,000 counter-protesters blocked 500 neo-Nazi demonstrators as they tried to march to the site of the death of Hitler ally Rudolf Hess.
Clear skies and lighter winds will bring a chilly night for many