In public statements and unauthorized interviews, investigators said they have discovered no work on former germ-warfare agents such as anthrax bacteria, and no work on a new designer pathogen -- combining pox virus and snake venom -- that led U.S. scientists on a highly classified hunt for several months. The investigators assess that Iraq did not, as charged in London and Washington, resume production of its most lethal nerve agent, VX, or learn to make it last longer in storage. And they have found the former nuclear weapons program, described as a "grave and gathering danger" by President Bush and a "mortal threat" by Vice President Cheney, in much the same shattered state left by U.N. inspectors in the 1990s.