21.   The third and second floors had collapsed.

22.   Then there was an explosion in the smoky building, and the floor beneath them collapsed.

23.   They died when the warehouse floor collapsed into a basement that was unknown to fire commanders.

24.   They were killed when the warehouse floor collapsed.

25.   Two floors completely collapsed.

26.   When one floor collapsed, its weight collapsed the floor beneath it, starting a catastrophic series of failures.

27.   At least two people were killed when the second floor of a game parlor collapsed.

28.   Boxing bouts were interrupted when the floor of the ring collapsed.

29.   Four buildings in the complex slid and their bottom two floors collapsed into waterlogged ground, trapping dozens, when typhoon Winnie hit northern Taiwan on Monday.

30.   Four firefighters were trapped when the main floor collapsed after a huge explosion and flames up to two stories high kept colleagues from saving them.