U.S. stock and options markets closed today, the first unscheduled, market-wide shutdown since September 2001, and may remain closed Tuesday, the Wall Street Journal reports.

The NASDAQ OMX Group today announced that The NASDAQ Stock Market and other NASDAQ OMX-owned U.S exchanges and markets and the FINRA/NASDAQ Trade Reporting Facility will be closed for business today and pending confirmation on Tuesday, October 30. All other NASDAQ OMX exchanges outside the U.S. will be open for business on Monday and Tuesday as scheduled.

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