BISMARCK, N.D. (AP) — Representatives of some oil pipeline companies who were targeted by activists showing support with Dakota Access pipeline opponents say the attempt to disrupt delivery was not successful.

A group known as Climate Direct Action tried to shut valves on two pipelines in Minnesota, one in North Dakota, one in Montana and one in Washington state on Tuesday morning. All of the lines move oil from Canada to the United States.

Officials say pipelines at four of the sites were temporarily shut down before the protesters could reach the valves.

In Washington, the Mountain Puget Sound pipeline system wasn't operating at the time of the attempt.

An Enbridge spokeswoman says the company regularly stops and starts its pipelines and reported "normal system operations" after the incident. Officials with Spectra Energy's Express pipeline in Coal Banks Landing, Montana, say they were offline for five hours.

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