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Elon Musk: Tesla boss mocks US regulator days after settlement  BBC NewsElon Musk accuses BlackRock of helping short sellers  CNBCMusk Ridicules SEC in Tweet Storm Days After Settling Lawsuit  BloombergTesla shares fall after Elon Musk taunts US markets regulator on Twitter and attacks short-sellers  Telegraph.co.ukElon Musk Tweet Appears to Mock the Securities and Exchange Commission  Wall Street JournalFull coverage |