CANNON BALL, N.D. — Law enforcement officers wearing riot gear and firing bean bags and pepper spray Thursday ousted protesters from a camp on private land in the path of the Dakota Access oil pipeline.

Hundreds of state and local police and the National Guard — some on foot and others driving trucks, military Humvees and buses — began the operation at midday and slowly enveloped the camp, arresting more than a dozen protesters who refused to leave.

There were no serious injuries, although one man was hurt in the leg and received treatment from a medic.