Anson Chi (credit: Collin County)

SHERMAN (AP) - A North Texas man accused of trying to blow up a natural gas pipeline in suburban Dallas has pleaded not guilty.

Anson Chi of Plano entered the plea Wednesday in federal court in Sherman, where he was indicted this month.

Chi remains in custody without bond pending trial on a charge of possession of an unregistered firearm or explosive device.

Investigators say Chi was seriously hurt June 18 when a bomb he allegedly made exploded on a natural gas regulator in Plano. Authorities say the device went off prematurely and caused little damage.

Chi’s next court hearing is set for early September.

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