The bombing of the EnCana pipeline near Pouce Coupe in northern British Columbia was being investigated by the Royal Canadian Mounted Police, The Province reported.
Someone living near the pipeline called police between 2 a.m. and 3 a.m. Saturday to report hearing a loud bang, investigators said. The company said employees were already nearby repairing damage from Wednesday's bombing, which was about half a mile away.
EnCana said the explosion Saturday caused a leak.
"These attacks aren't just against EnCana, they are against the entire community," Rhona DelFrari, a spokeswoman for EnCana, said. "We are becoming increasingly frustrated by this because it's becoming a risk to the public."
Cpl. Dan Moskaluk, an RCMP spokesman, said two additional officers have been added to the force in Dawson Creek because of the explosions. But he said the most recent blasts mean police are getting more tips from the public.
"We are dealing with domestic terrorism," Moskaluk said. "This is an attack on a critical infrastructure."