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Shares of Tesla Motors Inc. (Nasdaq: TSLA) dropped more than 5.5% on Monday on a report from WardsAuto.com that sales had fallen 26% in nine months. The news shook CEO Elon Musk so much that he took to Twitter to call the report false. Musk wrote that sales for Tesla in the U.S. were up 65% year over year in September. Tesla stock is up more than 3% in pre-market hours.