We are under attack,' he yelled down the line to his brother ... His office was on the 105th floor of the North Tower of the World Trade Centre - the first twin tower that was attacked.

Most of the time it was even - right in line with the window we were staring ... how many people fell or jumped from the Twin Towers. Estimates put it as at least 37 and probably more than 50 ...

It was, as Angus Kress Gillespie, author of the book Twin Towers, put it, "a pioneering translation into the vertical of horizontal mass transportation." The result: 75 percent of the floor space ...