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60 Minutes learned that the U.S. Environmental Protection Agency had documents showing that 100 chemical facilities in this country stored enough toxic chemicals for each to put more than a million people at risk in the event of an accident or deliberate attack. The news team investigated what kind of security existed at "high-risk" facilities, talked to experts, present and former government officials and environmentalist groups to put this report together. The three month investigation looked at plants in highly populated cities like Los Angeles, New York, Houston and Chicago; and found that there are no federal regulations in place when it comes to security.