Hijacked commercial airliners were purposely crashed into them.
It was 2 plains that smashed into them causing a lot of pressure making it break and fall to the ground.
No, the second tower (the one which was hit by the second plane) collapsed a few minutes after the first tower.
There were two planes at different times the same day, September 11, 2001. The planes did not fall on the towers. They were deliberatley flown into the towers by Muslim extremists and they were ordered to do so by Osama Bin Laden.
Aeroplanes
The Government says it was terrorists on planes. I say it was a bomb...
The Twin Towers did not fall down in the traditional sense. They were broken up at least in part by explosions and the resulting debris fell down. http://www.youtube.com/watch?v=nUDoGuLpirc
The terrorist group called Al Qaeda
10:38am when the twin towers started to fall
2 planes with terrorists wanted to destroy the twin towers
Tuesday.
They weren't even built in the 1700s, so no. They crashed in 2001
2001
tuesday
well osama wanted to knock down the twin towers because he wanted to get pay back
quickly
the twin towers fall
15.30