US leaders including Vice President Joe Biden and survivors of the Boston Marathon bombing shared messages of thanks and defiance at a tribute to the three people killed and 264 wounded in the attack exactly one year ago.
From Patrick Downes, who lost a leg when a pair of homemade bombs ripped through the crowds at the race's finish line, to Biden, speakers recalled how those on the scene, from police officers to spectators, reacted immediately to help the wounded amid the chaos on April 15, 2013.
Former Boston Mayor Thomas Menino, who managed the response to the attack in the final year of his two decades in office, recalled the struggles of the families of Martin Richard, 8, Krystle Campbell, 29, and Chinese national Lu Lingzi, 23, who died in the attack
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The operation to recover the unexploded bomb near the Houses of Parliament let to disruption in central London overnight.
Southern parts of England and Wales will see sunny skies after a frosty start.
A police spokesman said the incident in the Bourke Street Mall on Friday was not related to terrorism.