21.   Spence and his buddy John Barr were sheltering on the porch of the empty Burns Graphics building on Seventh Street when a wall behind them collapsed.

22.   That accident occurred when a dam wall collapsed at a Harmony Gold Mining Ltd. mine in the Free State.

23.   The boy was hurt when a bomb blast caused a wall to collapse on top of him, Halim said.

24.   The partition offered little or no protection when the wall collapsed.

25.   The wall collapsed, killing Weiss, the army said.

26.   Three people were killed when a wall of an apartment building in Harlem collapsed Tuesday morning.

27.   Three Israeli soldiers were injured when a wall collapsed on them.

28.   Tons of brick and concrete crashed to the floor of a shopping mall Thursday when a wall collapsed, killing at least three people.

29.   When the inner eye wall collapses, the eye expands, and winds abate.

30.   When, for example, the walls collapse down a bank into a road, his department unceremoniously pushes them out of the way.