You think this is natural? After millions of gallons of water it keeps burning for 99 days.
"After 99 days of burning, NYC declares the WTC fires are extinguished - 9 x 11 = 99.
The World Trade Center fires burn continuously for 99 days, between September 11, 2001 and
December 19, 2001. The World Trade Center fire is the longest burning commercial fire in U.S. history."
http://www.september11news.com/Mysteries2.htm