Remembering the unforgettable

Silence fell on Ground Zero at 08:46 (1.46pm Irish time) today, exactly a year from the moment when a terrorist-guided airliner sliced through a crystal blue sky and murdered thousands.

Quiet spread across New York - a city still in mourning a year after the obliteration of its tallest buildings, the World Trade Centre - to the South Lawn of the White House to other observances across the nation and around the world.