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".
Tens of thousands of Americans have gathered in Washington to mark 50 years since Martin Luther King made his I Have a Dream speech.
Today marks 50 years since Martin Luther King's famous I Have a Dream speech - but how far has America come in realising that dream?