The US state of Ohio is suing oil and gas company BP for more than 33 million dollars (£21 million), alleging it double-dipped by taking state funds and money from insurers to clean up accidental leaks from underground storage tanks at hundreds of its petrol stations around the state.
The state's attorney general and the Ohio Petroleum Underground Storage Tank Release Compensation Board filed the lawsuit on Monday.
The board administers a fund used as a last resort when tank owners lack coverage or do not accept insurance money.
The lawsuit alleges London-based BP wrongfully obtained 33.3 million dollars in reimbursements from the fund, saying it had no insurance for the leaks when it often accepted insurance money for the same releases.
BP spokesman Jason Ryan said the company acted in good faith and will defend itself against the action.