Law enforcement and protesters are in a new confrontation on the site of the Dakota Access pipeline in North Dakota.
The Morton County Sheriff's Office estimated 400 protesters were on a bridge trying to go north on state Highway 1806 late Sunday evening. Law enforcement had formed a line to prevent their movement.
At least one person had been arrested.
Protesters' live video streamed from the scene appeared to show water cannon being used.
The bridge was closed after it was damaged by fire in October, shortly after law enforcement moved in to evict protesters from private property owned by the pipeline developer.