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."
More top news
Investigators have released images of two more people they wish to speak to about the Hillsborough tragedy.
The number of reported anti-semitic incidents in the UK have increased by just over 50%, figures released by a charity have suggested.
Athletes competing at next years Summer Olympic Games in Rio de Janeiro will be using waters contaminated with human feces, a study finds.