[thackney]

From another source:

Herriman told investigators he manufactured the device at his residence and that the components used to construct it were still located there, including plastic pipes, what appeared to investigators to be black powder, a propane tank and batteries and wiring, the complaint says.

http://fuelfix.com/blog/2011/08/16/okla-man-due-in-court-for-natural-gas-pipeline-bomb/

[Charles Martel]

Herriman told investigators he manufactured the device at his residence and that the components used to construct it were still located there, including plastic pipes...

IMO, you'd need one hell of a big PVC "pipe bomb" to harm a steel gas line. This, however, was most likely a hunk of (PVC) pipe 1/2" x 12". Some retarded reporter or editor removed the forward slash.