11.   Police said gas was leaking from two cylinders in the room where the bodies of the couple were found.

12.   Sometime during the two minutes that the boosters burned, rocket gas leaked into some of the so-called J-joints, Holloway said.

13.   State Fire Marshal Roy Marshall said the gas may have leaked into the house.

14.   The cause of the blast was believed to be a gas leak, said Capt. Sergei Kalita, duty officer at the Interior Ministry office in St. Petersburg.

15.   The cold caused O-ring seals to fail in the right solid-fuel booster rocket and allowed blazing hot gas to leak.

16.   The gas then leaked into the water main and collected at a nearby subway construction site until a spark ignited it an hour later.

17.   The overnight freeze caused O-ring seals in the right solid-fuel booster rocket to deteriorate, and hot gases leaked from the joint.

18.   They suspect the deadly gas leaked out on some occasions, contaminating the area.

19.   Toxic chlorine gas leaked from a water purification plant in northwestern Japan on Friday, forcing dozens of people to evacuate their homes, police said.

20.   Fires caused by the orphanage explosion were quickly extinguished, but gas was leaking from a gas main fractured during the air raid.