Enbridge Inc said on Sunday a key segment of its oil pipeline system the U.S. Midwest will remain shut down for an undetermined period after a deadly vehicle accident in Illinois caused an oil leak and fire, likely squeezing supplies for refiners in the region.

The shutdown of Enbridge's 318,000 barrel a day Line 14/64, which extends to Griffith, Indiana, from Superior, Wisconsin, is also expected to pressure already-weak prices for Canadian crude this week as supplies back up in Alberta, market sources and analysts said.

Enbridge, whose pipelines carry the bulk of Canadian oil exports to the United States, idled the line early Saturday after what emergency officials described as a two-vehicle collision at an above-ground portion of the conduit close to a pumping station near the township of New Lenox, Illinois.

Two people, including a firefighter, were reported killed and three others were critically injured.

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