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N.D. – (AP) About 300 opponents of the Dakota Access pipeline demonstrated on Thanksgiving Day in Mandan, about 50 miles north from where demonstrators have camped out for months to protest the construction of the four-state pipeline.

The Bismarck Tribune reports protesters blocked traffic at an intersection and nearby streets Thursday morning. Some shouted “Shame on you, North Dakota!” and others carried a banner that read “No pilgrims, no pipeline.”

About 50 officers stood across from the protesters, and the crowd eventually dispersed. At least one demonstrator was arrested. When protesters blocked the intersection they set up several folding tables with pumpkins and a pig head. They also passed out food.

Meanwhile, law enforcement in North Dakota issued a phone alert warning residents about the presence of protesters against the Dakota Access pipeline.

Authorities also urged people to report any “suspicious activity.” Authorities say “rioters” in the area intend “to create an unsafe environment for the public.”

Protests have intensified in recent weeks, with total arrests since August rising to more than 520.

According to several media reports, 90 percent of the protesters do not live in North Dakota.