1.   But experts predict that a landslide would rupture chlorine tanks.

2.   The tragedy was blamed on the failure of a Challenger rocket booster, which ruptured the tank.

3.   Authorities said the ammonia was released when a piece of metal gave way, rupturing a tank containing the toxic fluid.

4.   Debris from a burst tire struck a fuel tank, according to the report, causing shock waves to rupture the tank from within.

5.   The tank was ruptured and the fuel ignited but the fire was put out quickly and nobody was hurt.