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By Maria Golovnina and Guy Faulconbridge LONDON (Reuters) - Prime Minister David Cameron convened an emergency meeting of his intelligence chiefs on Thursday after two Islamists hacked a soldier to death with meat cleavers on a south London street. A dramatic clip filmed by an onlooker just minutes after Wednesday's killing showed a man with hands covered in blood shouting Islamic slogans and promising revenge on Britain for its participation in wars in the Muslim world. "We swear by almighty Allah we will never stop fighting you. ...