Images of the memorial service in Surrey commemorating the assassination of John F Kennedy have been tweeted by the American ambassador to Britain.
In his tweets, Matthew Barzun said President Kennedy's legacy was "the antidote to cynicism or doubt" and encouraged supporters to "keep conviction and hope alive in his honour".
He praised Britain's "generosity" for building the 1965 memorial, which he described as "a part of England that will be forever America".
As the world remembers the assassination of John F. Kennedy, many are reviewing his final day and the evidence around his murder.
President Kennedy's assassination left America permanently scarred.
Half a century since the murder of President John F Kennedy in Dallas, America pauses to remember their fallen hero.