America marks the 25th anniversary of 9/11

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’ll 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)