Undated supplied photo shows oil containment booms along the coast of Mauritius following a massive oil spill. (Photo courtesy of the Mauritius government)(Kyodo)

TOKYO - Mitsui O.S.K. Lines Ltd. pledged Friday about 1 billion yen ($9.4 million) in aid to Mauritius in response to an oil spill from a grounded Japanese freighter operated by the company, including an 800 million yen fund for cleaning up the environment.