Oil deepens loss on Iran talks; Brent ends March down 12 percent

Reuters: Oil fell for a third straight session on Tuesday, with Brent crude tumbling 12 percent for the month, as world powers entered into intense negotiations with Iran for a nuclear deal that could bring more of its oil to an oversupplied market.

The tumble was proof of the hurdles oil faced in establishing a bottom for prices since the selloff that began in June on worries of a supply glut. U.S. crude fell 11 percent for the quarter.

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