North Dakota authorities have issued an arrest warrant accusing a pipeline protester on horseback of charging at a police officer.

Mason Redwing, of Fort Thompson, South Dakota, is wanted on felony charges of terrorizing and reckless endangerment in the Sept. 28 incident near St. Anthony. He's also wanted on a previous warrant for criminal trespass.

The Morton County Sheriff's Office says the officer shouted a warning and pointed a shotgun loaded with non-lethal beanbag rounds to defuse the situation.

Court documents don't list an attorney who can speak on Redwing's behalf. His home telephone is not listed.

Thousands of people have protested the four-state Dakota Access pipeline in southern North Dakota in recent months. Several protesters disrupted a governor candidate debate in Bismarck on Monday. No one was arrested.