The plume that fuels Yellowstone's famous geysers and hot springs appears to be larger than once thought.
The body of a man swept away by the tsunami waves that hit California following the March 11 Japanese earthquake has been found.
Japan on Monday widened the evacuation zone around a stricken nuclear plant exactly a month after the crisis began and as another 7.1 magnitude quake and tsunami alert strained nerves anew.
Plugging the water leak boosts efforts to contain the world's worst nuclear disaster since Chernobyl.
The stricken nuclear power plant needs to dump 11,500 tons of radioactive water to continue with repairs.
Officials believe, but can't confirm that containers holding the radioactive fuels at Japan's damaged plant remain intact.
Japan said on Tuesday it is on "maximum alert" over a crippled nuclear plant where highly radioactive water has halted repair work and plutonium has been found in the soil.
Although they're unlikely to trigger quake in distant regions, massive quakes can trigger more seismic activity along the same fault.
Seawater north of the plant was found to have 1,150 times the legal limit of iodine.
Radioactive iodine in the city's tap water was measured to be twice the safe level for infants.