1.   One of the joints in the pipe was cracked and gas was escaping.

2.   As of last night, the mayor was in less pain, perhaps because doctors had inserted a naso-gastric tube that allows gases to escape.

3.   Investigators found that the cold stiffened O-ring seals in the booster rockets, allowing hot gases to escape and ignite the large external fuel tank.

4.   No gas escapes.

5.   Officials said the gas would not escape the building.

6.   The gas did not escape.

7.   Their primary goal was to vent the building by breaking windows and punching holes through doors and screens, which allows potentially explosive gases to escape.

8.   There were also cases in which gas was escaping from pipes connected to a turbine pump in the fuel tank, which moves gas to the gas pump.

9.   A company spokesman said that some gas escaped from a pipe during a transfer from a ship to the storage complex.

10.   Army officials said they would monitor air to make sure no gas escaped.