Dmitry Medvedev, deputy chairman of Russia's Security Council, and a mouthpiece of Russian president Vlad Putin, has said that the US will soon face another 9/11 attack, involving nuclear and/or biological; weapons. He did not specify exactly who might do this, but did not need to as the US is getting an impressive array of enemies, Russia, communist China, North Korea, and Iran. The first three are armed to the teeth with nukes, with Russia having more than the US, although up to a point the number is academic. All three are capable of launching EMP (electro-magnetic pulse) attacks that could cripple the entire electric infrastructure of nations.
As I see it, something like this will substantially differ from 9/11, being real rather than government produced, if one follows the conspiracy theories as I do. It will ring in a radical change of consciousness.