A group of scientists have published their results into a peer reviewed journal, Open Chemical Physics Journal, stating that within the debris of the WTC, they have found evidence of a "highly engineered explosive".
The paper's abstract read, “We have discovered distinctive red/gray chips in all the samples we have studied of the dust produced by the destruction of the World Trade Center.”
Their analysis claims to show "active thermitic material" known as "nanostructured super-thermite." Thermite is used in demolition, hand grenades, welding, and fireworks. It is known for creating a chemical reaction that creates very high temperatures.