The Yokohama Local Marine Accidents Inquiry Commissioners’ Office asked authorities Aug. 21 to investigate the July 2 accident in which a Panamanian-registered supertanker ran aground in Tokyo Bay, resulting in a massive spill of crude oil.

The Yokohama Marine Accidents Inquiry Agency was asked to investigate the cause of the accident involving the Diamond Grace, a 259,999-ton Japanese-owned tanker, the commissioners’ office said.

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