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Updated from 5:12 p.m. EDT

The extra session turned hideous, especially for technology stocks, compounding the pain the major averages inflicted on investors during regular trading.

The culprit was

Intel

(INTC) - Get Intel Corporation (INTC) Report

, which lowered its revenue guidance for the second quarter. The chipmaker now expects a top line of $6.2 billion to $6.5 billion, a range well below analysts' estimates.

Shares of Intel were falling 10% to $24.30 after the company offered its guidance.

Intel tried to soothe Wall Street by saying it still expects a stronger second half of the year, but no one cared. From the looks of it, the broader market and tech shares in particular could be in for a rough session Friday.

That's not what investors want to hear of course, especially after the regular session Thursday in which the

Dow Jones Industrial Average closed with a loss of 172.16 points, or 1.8%, to 9624.64.

The

Nasdaq fell 40.38 points, or 2.5%, to 1554.88, and the

S&P 500 dropped 20.75 points, or 2%, to 1029.15.

The Instinet volume leader board after the close revealed widely held tech stocks in a tailspin. The

Nasdaq 100 Unit Trust

(QQQ) - Get Invesco QQQ Trust Report

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was down 3% to $27.98.

Microsoft

(MSFT) - Get Microsoft Corporation (MSFT) Report

was down 3.2%, and

Cisco

(CSCO) - Get Cisco Systems, Inc. Report

was falling 5.2%.

Sun Micro

(SUNW) - Get Sunworks, Inc. Report

was lower by 4%.

Dell

(DELL) - Get Dell Technologies Inc Class C Report

was losing 6%, and

Hewlett-Packard

(HPQ) - Get HP Inc. (HPQ) Report

was down 2%.

Overall, volume was heavy. In the first hour and 15 minutes of extended trading, more than 12 million shares changed hands among the 20 most active stocks on Instinet. Not surprisingly, Intel was the volume leader.

Anything in the chip and chip-equipment sectors was getting pummeled.

Applied Materials

(AMAT) - Get Applied Materials, Inc. Report

was falling 8%, while

KLA-Tencor

(KLAC) - Get KLA Corporation (KLAC) Report

and

Novellus

(NVLS)

were each losing 7%.

Kulicke & Soffa

(KLIC) - Get Kulicke & Soffa Industries, Inc. Report

was losing 8%,

PMC Sierra

(PMCS)

was down 6% and

Integrated Silicon

(ISSI)

was falling 7%.

Xilinx

(XLNX) - Get Xilinx, Inc. (XLNX) Report

was down 6%, and

Integrated Device Technology

(IDTI) - Get Integrated Device Technology, Inc. Report

was tripping 7%.

Elsewhere,

WorldCom

(WCOM)

and

Nortel

(NT)

were dropping 4%.

Palm

(PALM)

was off 5%,

Brocade

(BRCD)

was losing 5%, and

Oracle

(ORCL) - Get Oracle Corporation Report

was giving back 3%.