91.   The city hall tower collapsed.

92.   The crisp autumn air was tinged with an acrid smell from the debris, a constant in lower Manhattan since the twin towers collapsed.

93.   The data accumulated will be stored on a map that would help engineers understand how the twin towers collapsed, Deputy Fire Commissioner Thomas Fitzpatrick said.

94.   The center was fully rented out when the towers collapsed Tuesday.

95.   The southern tower collapsed with a roar about an hour later.

96.   The twin towers collapsed after two airliners smashed into them.

97.   The towers collapsed last week after a pair of hijacked planes slammed into them.

98.   Then the tower collapsed and the crowd panicked.

99.   Then the towers collapsed and Marr put his book on hold.

100.   Though the Skrunda tower collapsed in a matter of seconds, experts said bringing it down was not as easy as it appeared.