The North Dakota Army National Guard reportedly deployed an "anti-drone missile system" at the site of the Dakota Access oil pipeline on Tuesday. North Dakota Guard spokesman William Prokopyk confirmed to The Daily Beast the presence of the Avenger missile system. He added that the system was put in place "strictly in the observation role." The Morton County Sheriff's Department echoed Prokpyk's statements, adding that the systems "are used strictly for observation of ungoverned encampments to help protect private property and maintain public safety," according to The Daily Beast. Jon Ziegler, who describes himself as a "citizen journalist," spotted the surface-to-air missile launchers at the site.