By Zack Colman - 06/13/13 08:45 PM EDT
The department is seeking civil penalties under federal law, while Arkansas is looking for the same under state violations, Reuters reports.
An Exxon spokesman said the company has yet to review the allegations and had yet to be formally served with the complaint.
The spill sparked debate about the wisdom of shipping heavy Canadian crude across the United States, as the State Department considers TransCanada Corp's application for the Keystone XL pipeline, which would link Alberta's oil sands to refineries in Texas.
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