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The Dow is off over 140 points.
Underperformers include Bank of America, which reported disappointing earnings this morning, and Intel, which reported in line earnings yesterday.
Traders appear to have grown accustom to companies beating analysts' earnings expectations, which neither of these companies did.
Shares of Apple are off by over 2%. Some are attributing the sell-off to an earnings warning from Cirrus Logic, an Apple supplier.