Hundreds of demonstrators gathered on Highway 1806 — just north of the main protest camp.
Protesters say police are firing tear gas and rubber bullets at them while they are trapped on Backwater Bridge. They also say firefighters are intentionally spraying them with a water cannon in sub-freezing temperatures.
However, a spokesperson for the fire department says the firefighters are using hoses to put out fires set by protesters.
Several armored vehicles were also at the scene.
The pipeline is about 85% constructed, and the only remaining work to be completed in North Dakota is the section under Lake Oahe.
The Standing Rock Sioux tribe and environmental activists claim the pipeline construction will pollute nearby water sources and destroy the tribe’s sacred sites.
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