(WARNING! AmericanFreePress is claimed by oilempire to be ultra-right-wing hoaxers.)
Foreign Firms Charged With Disposing of WTC Evidence

Why did a foreign company—headed by a knight of the British Empire—manage the controversial “clean-up” of the rubble at the World Trade Center and the Pentagon?
Not that that in itself is a very interesting question, but this article nevertheless gives some good insight into the cover-up, of the evidence from WTC ruins.
An excerpt:
Tully Construction specializes in concrete. AFP asked Tully if he had ever seen concrete pulverized as it was at the WTC.
“No—never,” he said.
Tully said that there were hot spots where he observed “literally molten steel.” Asked about what could have caused such intense heat, Tully said, “Think about the jet fuel.”
So the expert has never seen concrete pulverization before. We’re not explicitly told whether he has seen molten steel before, but judging from his naive guess at the jet-fuel, I would assume not.