Prince William: Ivory poaching "a loss to all humanity"

Prince William met Barack Obama at the White House before making a speech to the World Bank about the need to tackle the scourge of poaching for ivory and rhino horns. He called it "one of the most insidious forms of criminality in the world today."

Meanwhile his wife, the Duchess of Cambridge, visited Harlem's Northside Centre for Child Development.

Nicholas Witchell reports from Washington on the royal couple's movements.