[Phillips:] Breaking news now from China. The confirmed death toll we are told is more than 34,000 now. This is from last week's earthquake. It's expected to top 50,000, we are told. China's official news agency says that more than 200 relief workers were buried by mud slides while working to repair roads in Sichuan Province. China now appealing to international aid donors for tents for the survivors that have been left homeless by this quake. And China is also observing three days of national mourning for earthquake victims. Overnight, China came to a stand still as horns wailed. You can hear it. 2:28 p.m. exactly one week after that quake struck. Well, that earthquake is prompting new concerns this morning. And it has scientists, spies and nations working together. CNN State Department correspondent, Zain Verjee, shows us how.
[Zain Verjee, Cnn State Department Correspondent:] It's where the quake hit China that set off alarm bells among Washington spies and scientists. This is the area of the quake in China, but it's also an area that is very important to China for another reason. What is it?
[Hans Kristensen, Foundation Of American Scientists:] The quake has happened right in the heartland of China's nuclear weapons production area. There are three major facilities, one here where they design the weapons, one here they assemble them and one up here where there's a nuclear plutonium production reactor.
[Verjee:] How high are the chances of radiation leaks?
[Kristensen:] It's hard to say. It really depends on the damage. It is a very severe accident. And some of these buildings are old, going back to the 1970s. We just don't know how strong they are.
[Verjee:] China says it's checking.
[Wang Baodong, Press Counselor, Chinese Embassy:] I believe that the Chinese government is preparing for every consequences.
[Verjee:] And after an extraordinary request from China, the U.S. is sharing satellite images of damaged roads, bridges and dams. U.S. intelligence official tells CNN it's also keeping an eye on China's nuclear facilities to look for damage. What concerns you the most right now?
[Kristensen:] Well, right now it is either the release from the reactor here itself if it was damaged, or the nuclear reprocessing facility they also have here where high level radioactive waste could leak into the river that you could see running right through the area.
[Verjee:] No sign of leaks so far, experts say. But given the danger, the close watch continues. Zain Verjee, CNN, Washington.
[Roberts:] Progress in the relief efforts in Myanmar to tell you about. For the first time the military government allowed a United Nations official into the area hardest hit by the cyclone. And U.N. Secretary General Ban Ki-Moon has been given permission to visit there as well. He's going to arrive in Myanmar on Wednesday. Tomorrow, Myanmar will begin a three-day mourning period for cyclone victims, according to the Associated Press. And if you would like to help the people in Myanmar and "Impact your World," head to CNN.comimpact to find the aid agency that are helping out there.
[Phillips:] Possible new cause for allergies and asthma in kids. It's linked to how much mom felt which when she was pregnant.
[Roberts:] And they're not your everyday temps. Where and why executives and bigwigs are showing up as daily hires. Coming up on AMERICAN MORNING, betting on a winner.
[Unidentified Male:] All the guys are walking about "Big Brown."
[Roberts:] Inside the unusual marriage of horse and household name.
[Unidentified Male:] We wouldn't be doing it if we didn't think there was a nice return on it.
[Roberts:] Inside Big Brown's marketing deal ahead on AMERICAN MORNING.