By Nicole Friedman 

NEW YORK--Oil prices slid Monday on concerns about rising crude inventories, while diesel prices jumped as cold weather in the Northeast boosted demand.

Light, sweet crude for April delivery settled down $1.36, or 2.7%, to $49.45 a barrel on the New York Mercantile Exchange.

Brent, the global benchmark, fell $1.32, or 2.2%, to $58.90 a barrel on ICE Futures Europe.

A rally in crude-oil prices halted last week after U.S. data showed that domestic crude inventories are at their highest in about 80 years.

"Troubles continue to grow for the U.S. crude market," Morgan Stanley said in a weekly report, adding that U.S. data on supply and drilling are "likely to appear ominous" in the coming weeks.

Prices briefly spiked Monday afternoon on a Financial Times report that the president of the Organization of the Petroleum Exporting Countries could call an emergency meeting of the cartel if oil prices keep falling.

The cartel's November decision not to cut its output quota sent oil prices tumbling to multiyear lows.

However, the OPEC president is from Nigeria, a country that is considered less powerful in OPEC and that is struggling economically due to low oil prices. Saudi Arabia, OPEC's largest producer, is considered the driver behind the cartel's current strategy.

"The market is obviously just skeptical" of the report, said Dominick Chirichella, analyst at the Energy Management Institute. "The market is in a mode of starting to just slowly recognize that inventories are surging."

A United Steelworkers strike expanded over the weekend, with union workers now striking at 12 refineries that account for 19% of U.S. refining capacity. That is threatening three-fifths of crude-oil demand in the east of the U.S., according to industry newsletter The Schork Report.

Libya's largest oil field resumed operations on Sunday, after a pipeline was blown up about a week ago, and the key oil export terminal at Zueitina in eastern Libya also restarted operations.

Front-month diesel futures soared Monday as frigid temperatures in the eastern U.S. boosted demand for heating oil to heat homes and diesel fuel to use in power generators.

March diesel futures jumped 5% to $2.2179 a gallon, the highest settlement since Nov. 28.

"Our prices here have just skyrocketed," said John Zehler, president of Virginia Fuels Inc., a gasoline and distillate-fuel wholesaler. "It's extremely serious."

Gasoline futures rose 0.3% to $1.6462 a gallon, the highest level since Dec. 9.

Georgi Kantchev and Eric Yep contributed to this article.

Write to Nicole Friedman at nicole.friedman@wsj.com

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