WORLD leaders will light an eternal flame, and former New York Mayor Rudolph Giuliani will lead a reading of the names of 2,823 victims during a day of “simple and powerful” observances marking the anniversary of the World Trade Center attacks.

An FBI informant secretly recording a conversation with a tax assessor ended up making what is believed to be the only known uninterrupted audio recording of the September 11 attack on the World Trade Centre in New York.