It was mostly peaceful at the North Dakota pipeline protests this weekend

After a tense week, protestors remained peaceful – but it doesn't mean they're backing down.

Protests at the North Dakota pipeline were calm over this past weekend.

Tensions were very high last week – 141 people were arrested after demonstrators opposed to the project had blockaded a highway through land owned by the company building the Dakota Access Pipeline.

Many of the protestors threw rocks, molotov cocktails, logs, bottles and other debris at officers when they tried to remove them.

Leaders at the camp say some protestors acted out because they are traumatized by what the police have done to them, but that the elders are encouraging everyone to stand down, The Bismarck Tribune reported.

The Sioux Chief and Morton County Police Department even shook hands on Sunday, in a public show of cooperation.

A missing person and a fire

After the clashes Thursday, the past two days have been marked by a large fire on nearby private property, and a missing person that might have drowned.

There was large fire in rural Morton County early Sunday morning, the Sheriff's Department said on Facebook. The fire was put out by helicopter and is still being investigated – no injuries were reported.

And officials were searching for a missing person after a canoeing incident in the Cannonball River near a protest camp, Inforum said.

Sioux leaders want more peaceful days

In a post on Facebook, Chairman Archambault II of the Standing Rock Sioux Tribe urged protestors to remain "peaceful and prayerful."

"We must not resort to the corruption & violence our people have endured. If we stay true to their instructions, there are no odds we cannot beat, there is no greed we cannot overcome & there is no amount of corruption that can defeat us," he wrote.

Although the roadblock remains in Cannonball, protesters and police agree that it needs to be removed, especially since it is hard for ambulances to get through, MyNDNow said.

Of course, even though things may be peaceful right now, that doesn't mean protestors are losing their will to fight.

"They're not going to back down, we're not going to back down either," said Chief Arvol Looking Horse.

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