The Times said in an extensive article dated Wednesday that it had worked with computer security experts to monitor, study and then eject the attackers.

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Ralph Langner, a German computer security researcher who was among the first people to study Stuxnet, told various media outlets that after Stuxnet recognizes its specific target, it does something no other malware program has ever done.

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After surreptitiously tracking the intruders to study their movements and help erect better defenses to block them, The Times and computer security experts have expelled the attackers and kept them from breaking back in.

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