The head of U.S. Northern Command seems to be saying that there could be terrorist cells in the U.S., according to an article by the Associated Press. But this is one of those cases where both the headline some newspapers used for the story ("Al-Qaida Cells Forming In U.S., NorthCom Chief Says") and the story seem to be a bit confused, because it's not at all clear whether he means he has intelligence that such cells exist, or simply that in the absence of complete information, we should presume they might exist:
Okay, so we don't know if the cells exist, but we know we need to prepare for them, or at least that seems to be the message.
Air Force Gen. Victor “Gene” Renuart said in an interview that “to assume that there are not those cells is naive and so we have to take that threat seriously.” He took over as the head of U.S. Northern Command, whose headquarters is at Peterson Air Force Base in Colorado Springs, four months ago.