1.   Minutes later the second tower collapsed.

2.   Alston took a phone number but then the tower collapsed and he was unable to make the call.

3.   Among the crowd that waved flags and held flowers was Becky Morales, who lost her cousin, Nanda Ledesma, when the towers collapsed.

4.   And his customs broker, who escaped from his office at the World Trade Center before the twin towers collapsed, had no way to help coordinate deals.

5.   And then the tower collapsed.

6.   As the firemen attempted to rescue people trapped in the burning buildings, the south tower collapsed on top of them.

7.   As the twin towers collapsed just blocks away, a thick cloud of dust and debris enveloped the Broadway building and was sucked inside by the air-conditioning system.

8.   Both were at the scene and were separated when the south tower collapsed.

9.   A businessman from Jedda confesses that secretaries in his office cheered when they watched the trade towers collapse on CNN.

10.   A few minutes later, the tower collapsed.