US President Barack Obama has addressed an event to mark the 50th anniversary of Martin Luther King's "I have a dream" speech.
Speaking at the Lincoln Memorial in Washington DC, where the civil rights leader stood fifty years before, he said:
"We rightly and best remember Dr King's soaring oratory that day, how he gave a mighty voice to the quiet hopes of millions".
Fifty years ago, up to 250,000 Americans marched into Washington to hear Martin Luther King declare his dreams for the future. It was a speech that defined the civil rights movement.
Today, thousands have returned to Lincoln Memorial to remember the day that became a catalyst for reform in the United States.
ITV News' Special Correspondent Rageh Omaar reports.
The White House has tweeted a picture of President Obama's framed copy of the original March on Washington program in the Oval Office on its 50th anniversary.
Robbie Novak, who plays the Kid President" in a series of popular YouTube videos, has spoken at Washington's Lincoln Memorial on the 50th anniversary of Martin Luther King's "I have a dream" speech.
He told the crowd: "I wasn't here 50 years ago...we all have a duty to make sure the world keeps dreaming for better things".
On the 28th August 1963, over 200,000 people marched to the Lincoln Memorial where Martin Luther King addressed the crowd with his historic 'I Have A Dream' speech.
A peal of bells marked 50 years since Martin Luther King delivered his historic I Have A Dream speech in London's Trafalgar Square at 3pm this afternoon.
Across the world today nations are paying tribute to the black civil rights leader who urged the world to "let freedom ring" as he addressed a rally of 200,000 people in Washington in 1963.
Dozens of young people took part in the Trafalgar Square event as part of The Dream Series, Director Natalie Wade said:
"Fifty years on and it's hard not to be inspired by the Martin Luther King speech and the March on Washington."
The youngest daughter of Martin Luther King has paid tribute to the civil rights leader on the 50th anniversary of his "I Have a Dream" speech.
Bernice King said the anniversary should "inspire" people to continue fighting for freedom.
Video footage courtesy of Sony/Emi
President Barack Obama said his success in attaining the US's highest political office is a testament to the dedication of Martin Luther King and other civil rights activists.
Later today, Obama will speak on the same spot that King delivered his famous I Have a Dream speech 50 years ago.
"When you are talking about Dr. King's speech at the March on Washington, you're talking about one of the maybe five greatest speeches in American history," Obama said in a radio interview yesterday.
"And the words that he spoke at that particular moment, with so much at stake, and the way in which he captured the hopes and dreams of an entire generation I think is unmatched."