ST. LOUIS — The federal government and companies responsible for nuclear bomb production and atomic waste storage sites in the St. Louis area in the mid-20th century were aware of health risks, spills, improperly stored contaminants and other problems but often ignored them, according to documents reviewed by The Associated Press.

       Decades later, even with much of the cleanup complete, the aftereffects haunt the region. Federal health investigators have found an increased cancer risk for some people who, as children, played in a creek contaminated with uranium waste. A grade school closed last year amid radiation concerns. A landfill operator is spending millions to keep underground smoldering from reaching nuclear waste illegally dumped in the 1970s.

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       The AP examined hundreds of pages of internal memos, inspection reports and other items dating to the early 1950s, and found nonchalance and indifference to the risks of materials used in the development of nuclear weapons during and after World War II.