What was burning in WTC7 at a temperature hot enough to melt steel.

Investigation files on the Enron scandal? New York Times
Feb 2, 2002

"Perhaps the deepest mystery uncovered in the investigation involves extremely thin bits of steel collected from the trade towers and from 7 World Trade Center, a 47-story high rise that also collapsed for unknown reasons. The steel apparently melted away, but no fire in any of the buildings was believed to be hot enough to melt steel outright."

http://www.nytimes.com/2002/02/02/nyregion/search-for-clues-towers-collapse-engineers-volunteer-examine-steel-debris-taken.html?scp=1&sq=&st=nyt&pagewanted=2
 
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