Secretary of State John Kerry said the US would provide the Syrian opposition with $60 million (about £39 million) in new aid and added that they would work with the rebel fighters.
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A second police officer has died after he and a colleague were shot as they scuffled with a suspect in Florida.
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.