Six years ago today, almost 3,000 Americans were killed in the worst attack on US soil.
|Mourners gather at the site of the former|
World Trade Center [AFP]
In the years since the 9/11 attacks, has US intelligence-gathering improved? Is America winning "the war on terror"?
What are the threats that the American intelligence agencies take seriously?
On Tuesday, Riz speaks with the man who, for years, headed the CIA's National Intelligence Council, Robert Hutchings.
You can watch at 1900gmt, with repeats at 0000GMT, 0500GMT, and 0930GMT.
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