How horror of 9/11 unfolded minute by minute from hijackers at airport security to planes crashing into Twin Towers

SMOKE poured from a gaping hole in one of New York's Twin Towers after a passenger plane smashed into the skyscraper. But as images of the burning building were beamed around the world, many, including President George W. Bush, believed it was a terrible accident. Then, 17 minutes later, a second jet hit the other...