I'm not sure what else you would call planting and exploding a device near a natural gas pipeline, but it seems like it would be a terrorist act:

Police say a natural gas pipeline in northeast British Columbia that was bombed over the weekend did not rupture.

RCMP spokesman Sgt. Tim Shields said Tuesday the bomb was set beside a line that transports poisonous or sour gas and is owned by EnCana (TSX:ECA), about 50 kilometres east of Dawson Creek, near the B.C.-Alberta border.

Of course, since this is still on the North American continent:

"We are not characterizing it as an act of terrorism," Shields said. "It's an isolated criminal act."

Of course it was...