If it's been tough to gauge how much risk is posed by Japan's damaged nuclear plants, it's because officials have given what the New York Times describes as "confusing accounts" of exactly what's going on. Safety officials say the explosion at the Fukushima Dai-ichi plant destroyed walls of the building where the reactor is located, but not the metal housing enclosing the reactor, notes AP. The blast released radioactive material, but officials say the amounts are so small the public isn't endangered. Nevertheless, they widened the evacuation zone, warned people to stay inside, and prepared to distribute iodine tablets.