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a paper lantern into the river to honor the people of the hiroshima atomic bombing in world war ii and 70,000 people died instantly, and today is the 67th anniversary. the next hour of the the next hour of the newsroom starts right now. -- captions by vitac -- www.vitac.com i'm john berman filling in for suzanne malveaux. and this hour, we are learning more about the white supremist background of a man who gunned down six membersof a sikh temple in wisconsin, and we are hearing from the relatives of the people killed. >> he left this world protecting the people and the world, a...

i'm ali velshi, one of irene's last stops dealt one of its hardest blows. parts of vermont completely unreachable as rivers start to roar. one official describing the aftermath as awful. >> cut off in carolina. i'm carol costello. thousands who ignored evacuation orders stranded on the outer banks. emergency supplies heading there by ferry today on this "american morning." good morning. it is monday, august 29th. you lose track of it on these type of weekends when so much happens. there is a lot going on for a lot of people who say we missed -- we dodged the bull letsz, a lot of pe...

Expand, eventually to rupture, and first to release the gas that's already accumulated within spent fuel, and then as the uranium pellets in the fuel continue to heat up, more and more radioactive material will be squeezed out of the pellets, mostly in the form of cesium 137, which would be a gas at those temperatures. so if the fuel pool has gone dry, that would be a very hard condition to reverse. >> is there at that point a risk of explosion and do either of those matter at that point? >> well, there would be presumably a fire, because the metal around the fuel rods, which is zirconium will...

This would cause fuel rods to expand, eventually to rupture, and first to release the gas that's already accumulated within spent fuel, and then as the uranium pellets in the fuel continue to heat up, more and more radioactive material will be squeezed out of the pellets, mostly in the form of cesium 137, which would be a gas at those temperatures. so if the fuel pool has gone dry, that would be a very hard condition to reverse. >> is there at that point a risk or either of those matter at that point? >> well, there would be presumably a fire, because the metal around the fuel rods, which is z...

More radioactive material will be squeezed out of the pellets, mostly in the form of cesium 137, which would be a gas at those temperatures. so if the fuel pool has gone dry, that would be a very hard condition to reverse. >> is there at that point a risk of fire or explosion and do either of those matter at that point? >> well, there would be presumably a fire, because the metal around the fuel rods, which is zirconium will burn once it reaches a certain ignition temperature. so there could be a zirconium fed fire that would only serve to increase heat up of the rods and accelerate radioactiv...