The RCMP plans to post a reward for information to help solve the pipeline bombings in northeastern B.C., CBC News has learned.

Four bomb attacks have targeted EnCana energy facilities near Dawson Creek since October. The latest incident took place last week when a metering shed at a wellhead near the community of Tomslake was damaged.

Despite months of police investigation with the help of Canada's anti-terror squad, the RCMP still have no suspects.

RCMP spokesman Sgt. Tim Shields said Monday investigators have several local "persons of interest," but they have been unco-operative with police.

Police are now asking the community if they have any leads on who was behind the attacks, Shields said.

"The bomber is likely from the Tomslake area," he said.

"We are asking that if you have suspicions about someone or something that you come forward with it and let us have that opportunity to check it out."

The RCMP hopes the reward will be an incentive for people to call police with information.

An official announcement about the reward is expected at a news conference Tuesday.

First attack on Oct. 11

The first blast occurred on Oct. 11 beside a sour gas line about 50 kilometres east of Dawson Creek, B.C. The second occurred Oct. 16 along a pipeline off Highway 2, about half a kilometre from the provincial boundary with Alberta.

The third bombing occurred on Oct. 31, about 12 kilometres northwest of Tomslake, near the Alberta border.

Many residents have said they believe the explosions might be linked to a threatening letter sent to a local newspaper demanding that companies operating sour gas wells and pipelines in the area stop their operations.

With files from Betsy Trumpener