It was The South Tower. The South tower collapsed at approximately 9:59 a.m. followed by the North tower at at 10:28 a.m. read more
The final mystery of 9/11 will soon be solved, according to US experts investigating the collapse of the third tower at the World Trade Center. The 47-storey third tower, known as Tower Seven, collapsed seven hours after the twin towers. Investigators are expected to say ordinary fires on several different floors caused the collapse. read more