Thousands of people have gathered in Washington to mark 50 years since Martin Luther King's "I have a dream" speech.

They've lined the National Mall between the Washington Monument and the steps of the Lincoln Memorial - with organisers calling for more action on jobs, voting rights and gun violence.

The 1963 March on Washington was a crucial moment in the American civil rights movement.

And Dr Martin Luther King the third says his father's words speech still ring true.