Thousands of people are gathering in Washington to remember the Reverend Martin Luther King Jr's landmark "I Have a Dream" civil-rights speech half a century ago.
MLK: US Celebrates 50th Anniversary of Civil Rights March
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Marchers gather along the reflecting pool on the National Mall during the 50th anniversary of the 1963 March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington Aug. 24, 2013.
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Crowds line the Reflecting Pool to watch the 50th anniversary ceremony of the 1963 March on Washington ceremony, with the Washington Monument in the backround, Aug. 24, 2013.
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U.S. Park Police watch over the Lincoln Memorial during sunrise early in the morning before the start of the ceremony honoring the 50th anniversary of the 1963 March on Washington, Aug. 24, 2013.
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Marchers file towards their seats at the ceremony at the Lincoln Memorial honoring the 50th anniversary of the 1963 March on Washington, Aug. 24, 2013.