Dell also delayed its second-quarter results
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US regulators have stepped up their investigation into possible accounting irregularities at Dell.
The computer firm has been informed by the Securities and Exchange Commission (SEC) that it is conducting a formal probe into its accounting practices.
The investigation, which had been proceeding on an informal basis, relates to whether Dell accounts dating back to 2002 were mis-stated.
Its shares fell 2.5% on Thursday as it delayed issuing third-quarter results.
The delay is due to the "complexity" of the results, partly a by-product of the SEC investigation.