Protesters opposing the Dakota Access pipeline Sunday night were sprayed with water cannons despite the below-freezing temperatures.
About 400 protesters faced off against law enforcement near Highway 1806. Police in riot gear sprayed the crowd with water cannons, BuzzFeed News reports. Protesters also said rubber bullets and tear gas were used.
You can see drone footage of the incident here.
Local law enforcement said protesters had started "a dozen fires."
Here's how it looked on the ground.
What happens next
Protester Kevin Gilbertt said on Facebook Live things escalated after protesters removed a burned-out truck on what's known as the Backwater Bridge. Police were using the wrecked cars to block access to the bridge.
The average temperature was about 26 degrees Fahrenheit on Sunday, according to WeatherUnderground. On Friday, Morton County Sheriff Kyle Kirchmeier said in a statement that protesters should go home before winter set in and temperatures dropped even further.
Here's the video from Gilbertt.