General Motors Corp. faced another production crisis Wednesday after union workers at key plants in the Midwest walked off their jobs in frustration over the lack of progress in local contract talks.

Still unknown was whether more United Auto Workers members would strike while negotiators in Detroit continue to work on a new national contract for 215,000 GM workers. Talks were to resume later Wednesday.Workers in Indianapolis and Janesville, Wis., walked off their jobs Tuesday night. It was unclear if the walkouts were authorized by the national union, but they were intended to cause maximum harm to the world's largest automaker.

Janesville is the sole source of the Chevrolet Tahoe and GMC Yukon twins and the Chevy-GMC Suburban.

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