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JOHNSON COUNTY Federal investigators worked Wednesday to remove a key piece of evidence from the scene of Monday's natural gas pipeline explosion that killed one worker and injured eight others.

The National Transportation Safety Board will take a 100-foot section of the damaged 36-inch line back to the agency's laboratories in Washington for analysis.

The pipeline exploded in a massive fireball when a worker installing utility poles apparently drilled into the underground line, which is part of a 395-mile segment bringing natural gas from West Texas to East Texas.

E-mail jdouglas@wfaa.com

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