McClatchy Washington Bureau

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A 25-year-old Arlington man has been accused of attempting to shut down a Dallas medical clinic's computer system on the day before he was scheduled to quit his job as a security guard there, acting U.S. Attorney James T. Jacks of the Northern District of Texas said Tuesday.

Jesse William McGraw, who federal officials said was the leader of a hacker group called "Electronik Tribulation Army," bragged about hacking into the clinic's system on the Internet, according to a press release from the U.S. attorney's office.

FBI officials arrested McGraw Friday.

McGraw is accused of intruding several computers, including one that controlled the heating, ventilation and air-conditioning system and another that contained confidential patient information at the Carrell Clinic building on North Central Expressway in Dallas.

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