1.   High water pressure ruptured the pipe.

2.   If you thaw a pipe farther away from the tap, water could be trapped behind the ice block and could turn to steam, rupturing the pipe.

3.   If, despite all your precautions a pipe does freeze, it is important to thaw the ice before it expands and ruptures the pipe.

4.   The explosion probably ruptured high-pressure pipes in the compartments, thus increasing air pressure, Baltin said.

5.   Police said in a preliminary report that the blast occurred after careless workers at a construction site separate from the subway construction ruptured a pipe carrying liquid petroleum gas.

6.   Tamura, the gas company spokesman, said many gas pipes were ruptured, filled with water and disjointed.

7.   They reported that leak was caused by an explosion, apparently late Friday, that ruptured a pipe leading the gas out of the mill.