RCMP believe someone intentionally triggered an explosion at an EnCana facility in northeastern B.C. -- the fourth such blast in the past three months. But so far, investigators have no suspects.

A metering shed on an EnCana pipeline near the community of Tomslake, appears to be the subject of the "deliberate explosion," the Mounties said in a news release.

The shed, discovered Sunday by EnCana workers, was partly destroyed by the blast.

It's the latest in a string of what police say are intentional attacks against EnCana.

"There were no injuries or gas leakage as a result of the blast. This event is likely the fourth deliberate explosion in three months directed at EnCana natural gas facilities in the Tomslake area," the statement said.

The other explosions occurred in October, at other nearby EnCana facilities. In all cases, damage has been minimal and no one has been hurt.

The site is being probed by investigators from the Integrated National Security Enforcement Team, the Explosives Disposal Unit and Forensic Identification.

More information is expected to be released to media this afternoon.

Tomslake is a small, rural community located just west of the B.C.-Alberta border.

Earlier, when the October attacks occurred, the RCMP revealed they believed local perpetrators, who had local knowledge of the area, were behind the blasts.

EnCana spokesperson Alan Boras said for the most part, the relationship between the company and local residents has been "very good."

Last month, EnCana made a dedicated telephone line available so that the person or person responsible for the blasts could communicate with the company.

On Monday, Boras would not say whether anyone had yet made use of the phone line.

Also in December, police released eight pictures from a drug store security camera with eight people they wanted to identify.

Seven of these eight people have been identified and eliminated as suspects in the blasts. The eighth person has yet to be identified.

Police have also said they are concerned that the blasts are being carried out closer to populated areas.

The RCMP asks anyone with information to call the dedicated tip line at 1-866-994-7473 or Crimestoppers at 1-800-222-TIPS.

With files from The Canadian Press