EnCana vice-president Mike Graham says the company is offering $500,000 for tips that lead to an arrest and conviction in the recent bombing of its facilities in northeastern B.C. (CBC)

One of Canada's largest oil and gas companies is offering a cash reward of up to $500,000 for tips leading to an arrest and prosecution in the recent series of bombings targeting its natural gas facilities in northeastern B.C.

"We take the bombings of our facilities very seriously. The safety of our workers and the people who live in the communities where we operate is of paramount importance," said EnCana executive vice-president Mike Graham on Tuesday.

"That's why we are putting up this reward to help stop these bombings and end the threat that they pose to people in the Dawson Creek area," he said.

CBC News first broke the news of the planned reward on Monday, but the actual value was revealed by Graham at RCMP headquarters in Vancouver on Tuesday morning.

Since October, four bombs have been detonated: at two of the company's remote natural gas pipelines, a wellhead and a metering shed in the Tomslake area near Dawson Creek in northeastern B.C.

Unco-operative residents thwarting investigation: RCMP

After months of investigation, including a dedicated website, RCMP said Tuesday that its work was being thwarted by unco-operative residents who are opposed to sour gas exploration.

Police experts at the scene of a bombing near an EnCana sour gas line outside of Dawson Creek, B.C., in October. (CBC)

RCMP Sergeant Tim Shields said there are many individuals of interest in the case but so far, not enough evidence to consider anyone a suspect.

"There is a small group of individuals within the community who we have spoken to many times," he said. "They know full well who they are, and they have not been co-operative. And we are appealing to those people to do the right thing and come forward to our investigators and tell us what they know."

Both RCMP and EnCana officials said they are not concerned about a possible backlash in the community over the reward offering cash to people to turn in a loved-one or a friend to police.

No one injured in bomb attacks

The latest bombing incident took place last week, when a metering shed near Tomslake was damaged. The first three explosions last October involved pipelines or wellheads carrying sour gas, which contains toxic hydrogen sulphide.

"It is fortunate that no one has been seriously hurt during the bombings, but if they continue, there is a serious risk of injuries or death," Graham said.

"Whoever is responsible for these bombings has to be stopped before someone gets hurt. We hope this reward will encourage anyone who has knowledge of those responsible for the bombings to come forward and help put an end to these dangerous attacks," Graham said.

Anyone with information about the bombings is encouraged to contact the RCMP.

The legal terms of the reward published on EnCana's website say anyone who colluded in the bombings is not eligible for the reward.