hiroshima mayor kazumi matsui marked the anniversary by calling for the abolition of nuclear weapons. >> in order for us to live together, we need to end the use of all nuclear weapons, the ultimate in inhumane pure evil in the moment to get this done is now. amy: three days after the atomic bombing of hiroshima, the united states dropped a second atomic bomb on nagasaki, killing another 74,000 people. we'll have more on the bombings with nobel prize-winning japanese novelist kenzaburo oe after headlines. in other news from japan, at least 25 people have died amid record-breaking heat. tuesday marked tokyo's fifth consecutive day of temperatures over 95 degrees fahrenheit making it the longest such heat wave on record. in another sign of climate change, puerto rico is also facing an extreme drought, even -- dry conditions have prompted the government to extend water rationing to more people meaning a total of 400,000 residents will now receive water only every third day. in california, meanwhile, the largest of many drought-fueled wildfires has expanded to 106 square miles, crossing h