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Editor's Note: This story was updated at 4:50 p.m. ET to reflect additional statements from NASA. Contrary to the previous report, NASA denies it is undertaking any effort to look specifically for sabotage.
NASA does not suspect sabotage was behind the glitch that twice delayed the launch of the space shuttle Endeavour recently.
The agency is investigating all possible explanations for the problem, but has no specific processes to search for intentional tampering, officials said.
"NASA is not concerned about sabotage at all," NASA spokesman Kyle Herring said. "They develop a detailed fault tree to try to come to a conclusion as to what the problem is. The program leaves no stone unturned in an investigative effort. There is never a fault tree that has a block in it that's labeled sabotage."