Moody's Investor Service said it is considering whether to downgrade Overseas Shipholding Group (OSG) after the tanker giant's board approved a plan to split the company in two.

The US credit ratings agency said it put the New York-listed company's corporate family, senior unsecured credit and senior secured debt ratings under review.

"The review will consider the more modest scale of each independent entity after the spin-off, along with the loss of cash flow and business diversification from two separate businesses," Moody's said.

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