Carl Cameron is the reporter whose four-part story on Israeli Spying revealed that there was evidence linking 9-11 to the Mossad agents (aka the Dancing Israelis) arrested on 9-11, but that this evidence was classified by the US Government.
"Evidence linking these Israelis to 9/11 is classified. I cannot tell
you about evidence that has been gathered. It's classified information." --
US official quoted in Carl Cameron's Fox News report on the Israeli spy ring and its connections to 9-11.