Learn to do a web search properly, your search is meaningless as others point out.
From the Consumer Product Safety Commmission and National Fire Protection Association:
<quotes> Most home fires start in living rooms. Second is bedrooms, third is kitchens.
The leading cause of fatal home fire is smoking, followed by: arson, heating equipment, electrical distribution equipment, and then children playing with fire.
The number one cause in home fire resulting in injury, however, is cooking equipment.
Cooking is the leading cause of home fires in the U.S. It is also the leading cause of fire injuries. Cooking fires often result from unattended cooking and human error, rather than mechanical failure of stoves or ovens.
Two of every three home heating fires in the U.S. in 1998, and three of every four related deaths, were attributed to space heating equipment. </quotes>
So, let's see. Most fires start in the living room and bedroom where you are extremely unlikely to find any natural gas equipment. The fires that start in the 3rd most likely place, the kitchen, aren't caused by equipment failure.
Of the fires caused by heating equipment most of the fires and even more of the deaths are due to space heaters. I've never seen a space heater that was run by natural gas, most of them are electric.