11.   Investigators concluded that pyrotechnic gas did not cause the fire and have absolved the government of wrongdoing.

12.   Some reports said the explosion was caused by gas cannisters placed in the stolen car, as opposed to explosives, accounting for the relatively minor damage.

13.   Some reports said the explosion was caused by gas canisters placed in a stolen car, as opposed to explosives, accounting for the relatively minor damage.

14.   Some theorize that the gas might cause cancer cells to shift location and form tumors.

15.   The gases cause headaches, sore throats, vomiting and other ailments.

16.   The gases caused an explosion and fire, but the supply of fuel to the area was not affected, the company said.

17.   The gas caused five more explosions Thursday morning and ignited a fire, the newspaper said.

18.   Jiji Press news agency said the gas caused heart failure for more than ten people.

19.   Most scientific research indicates that such gases cause global warming and climatic change.

20.   Police suspected the explosion could have been caused by gas, but were still investigating.