Japan officials have suspended helicopter operations that have been dumping water on the Fukushima Nuclear Reactor that is undergoing cooling problems.
Here is a link to ABC News: http://abcnews.go.com/International/japan-nuclear-crisis-helicopters-operation-cool-fukushima-nuclear/story?id=13154536
Here is a link to howstuffworks.com: http://science.howstuffworks.com/japan-nuclear-crisis.htm
