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The trouble started in the morning, according to Nasdaq's version of events, when Arca tried to connect and disconnect more than 20 times with the Nasdaq's information processing system. Arca then sent a stream of price quotes for inaccurate stock symbols. The flood of data amounted to more than double the amount Nasdaq's processing system was tested to handle and 26 times the average flow. As a result, the company's processing system failed, which revealed a flaw in the system's software. Shortly after noon, the Nasdaq sent out an alert that said it was stopping trading in shares listed on its exchange. In its statement, the company said it had fixed the problem within 30 minutes but needed time to test its systems "to ensure that trading could be resumed in a fair and orderly manner."
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