The Globe and Mail reports in its Wednesday edition that a handful of anti-pipeline activists with lock cutters and the will to get arrested have become Canadian oil producers' newest hurdle to delivering crude to markets. A Bloomberg dispatch to The Globe reports that Enbridge said it was forced to shut its Line 9 from Sarnia, Ont., to Montreal for about four hours after the company's control centre detected that a valve had been tampered with and closed late on Sunday. It was the fourth time in two months that an Enbridge line was shut after such an incident. While deliveries were not affected by the shutdowns, the company plans to enact permanent security measures at valve sites. Spokesman Graham White says: "They have used lock cutters every time. In the latest three incidents, they destroyed locks or fences, sabotaged the equipment and departed without staging a protest." Saboteurs represent the latest hassle Western Canada faces in getting its crude to coastal markets as plans to build new pipelines are stymied by environmental and legal challenges. Tampering with pipelines is the latest form of opposition to moving crude oil, says FirstEnergy analyst Steven Paget.