David Cameron paid tribute to the spirit of Boston's people today as he visited the site of the marathon bombing.
A month after the attack which killed three and wounded dozens more, the Prime Minister toured the memorials in Copley Square accompanied by Massachusetts Governor Deval Patrick.
"Everyone in the UK stands with your great city and your great people," he told reporters in the square.
Mr Cameron said it was crucial to challenge the "narrative of violent extremism".That meant "standing for the values that we believe in", such as freedom, democracy and diversity.
"We know how important it is to stand up and say the terrorists will not win," the premier added.
"We will never give in to terrorists."
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Mr Osborne said he is "not the person to provide the unity my party needs".