1.   Cermak agreed that the impacts by themselves probably could not have collapsed the massively reinforced building on their own.

2.   Neither has a reinforced communal building that could be a shelter, Petty said.

3.   They also can be cut off by reinforced buildings and even heavy foliage on trees.

4.   The lab has maintained that its main supplies of radioactive materials and high explosives are safely protected from the fire in reinforced buildings or concrete bunkers.