1.   Eventually the water weakens the structure, and the walls and floors collapse.

2.   The firefighters died when the warehouse floor collapsed.

3.   Another guest, Avi Cohen, said he was at the refreshment table when the floor collapsed.

4.   Around the bay in Manzanillo, several floors collapsed at the local headquarters of the Colima State Judicial Police, Barron said.

5.   Around the bay in Manzanillo, several floors collapsed at the local headquarters of the Colima State Judicial Police.

6.   As the firefighters searched for the missing woman, the second floor collapsed, dropping them into a raging fire on the first floor.

7.   At another point, bin Laden expressed surprise that both World Trade Center towers fell to the ground, saying he expected only the top floors to collapse.

8.   A floor collapsed beneath their feet as they battled the blaze.

9.   A great hole gaped in the police building, where the top floors had collapsed.

10.   A minute later, they said, the floor collapsed.