9/11 Anniversary: A legacy that echoes 20 years on

America reflects on the war on terror and the legacy of the 9/11 attacks on the 20-year anniversary.

Nearly three thousand people died in New York, Washington, and in Pennsylvania. And tens of thousands more in the war on terror which followed.

Warnings from Washington and London are that terrorists are becoming even more "emboldened".

Sky's U.S. correspondent Mark Stone reports from Ground Zero.

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