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GM extends North American shutdown, does not set restart date

WASHINGTON, March 26 (Reuters) - General Motors Co said Thursday it will extend a shutdown of its North American plants beyond March 30, but added it does not know when it will restart operations.

In email to suppliers seen by Reuters, the largest U.S automaker said "given the unprecedented circumstances, exactly when we will resume production is unclear." (Reporting by David Shepardson; Editing by Sandra Maler)