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The Environmental Protection Agency's inspector general is expanding its investigation into the agency's culpability in August's mine disaster, which sent 3 million gallons of toxic sludge into the waterways of three states.

The agency's Office of the Inspector General said Thursday that it sent a memo Nov. 4 to its Region 8 office and the head of water cleanup in Washington, advising them that the inspector general is taking additional action in its investigation into the toxic wastewater spill at the Gold King Mine in Colorado.

The Office of the Inspector General said due to new information that has come to light, and a number of new requests from Congress, it is expanding the scope of its investigation, the memo reads. It said new information provided in a report by the Department of Interior last month was key in its decision, along with lawmakers' requests.

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