Vancouver, July 4 (Xinhua) -- EnCana-owned gas pipeline in the western Canadian province of British Columbia was targeted by a second bomb explosion in four days on Saturday, which police described as "domestic terrorism", according to local media reports.

    The bomb went off near Dawson Creek in the north of the province, not far from the bombing site on July 1. The recent case is the sixth pipeline attack since last October.

    The explosion caused gas leak but "no harms to the worker, the public or the environment," EnCana said via a statement by the Royal Canadian Mounted Police (RCMP).

    "This is considered domestic terrorism. These people, or this person, are terrorizing these communities of Pouce Coupe and Dawson Creek and inflicting stress on these people," RCMP Cpl. Dan Moskaluk was quoted by the Canadian Broadcasting Company as saying.

    Calgary-based EnCana, the largest North American natural gas producer, received warnings last October by an anonymous person to stop natural gas production in northern British Columbia. The natural gas produced and shipped through the pipes in the area contains deadly toxic hydrogen sulphide.

    A spate of bombings followed the warning letter, all taking place along a 15-to-20-kilometre stretch of the pipeline near Pouce Coupe, south of Dawson Creek.

    Moskaluk said police hope this sixth attack will trigger some tips to help them catch the bomber. EnCana has offered a reward of 500,000 Canadian dollars for information.