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Ceremonies are underway in the United States to mark the 25th anniversary of the 9/11 terror attacks in which nearly 3,000 people were killed. We鈥檒l look back at what happened that day, the intelligence failures and the reverberations still being felt.

Also on the programme: how Yemen's Houthi fighters are tightening their grip on a crucial global shipping route; and we'll hear from the founder and face of India's Cockroach Party protests.

(Photo: The Tribute in Light installation illuminated over the lower Manhattan skyline ahead of the 25th anniversary of the September 11, 2001 attacks on the World Trade Center. Credit: Reuters)