Police clash with pipeline protesters

Tension flared anew on the Dakota Access pipeline as protesters tried to push past a long-blocked bridge on a state highway, only to be turned back by a line of law enforcement using water cannon and what appeared to be tear gas.

Sunday's skirmishes began around 6 pm after protesters removed a burned-out truck on what's known as the Backwater Bridge, not far from the encampment where they've been for weeks as they demonstrate against the pipeline. The Morton County Sheriff's Department estimated 400 protesters sought to cross the bridge on state Highway 1806.