RCMP Sgt. Tim Shields said the second blast was discovered Thursday, although it wasn't clear when it happened as no one in the remote area near Dawson Creek reported hearing anything, the Globe and Mail reported.
"We have a crater in the ground about 4 feet across and there is damage to the pipeline," Shields said. "There was also a small leak that was quickly contained by pipeline workers."
The leaking gas contained deadly hydrogen sulfide, known as sour gas, the National Post said. There were no injuries as a result of the leak.
Signs of the first bombing was discovered Sunday by a hunter about 15 miles from the site of the second. The pipeline didn't rupture in that incident.
Last week, local media received a letter warning oil and gas companies to get out of the area, although no specific threats were made in the letter.
The RCMP terrorist squad and the Integrated National Security Enforcement Team are investigating the attacks, the Globe said.