Scores of people marched on the Army Corp of Engineers in Northeast Portland on Monday to show their support of the ongoing protests of the Dakota Access Pipeline on the Standing Rock Indian Reservation in North Dakota.

Tweets and photos from the protests show peaceful demonstrators singing and chanting while holding up signs that say "Water = life" and "People over pipelines."

People on the scene estimated there were between 100 and 300 people at the protest, which began at Holladay Park and ended at the Army Corps of Engineers Building, nearby.

Several people tweeted pictures and video from the event.

About to start marching around the army corp of engineers building. This guy says he's got family at #StandingRock & it's a warzone up there pic.twitter.com/nymFXYPDsm — Mike Bivins (@itsmikebivins) October 31, 2016

Portland, OR #StandingRock #NoDAPL solidarity event at the NW Division of US Army Corps of Engineers pic.twitter.com/LGjYsDIHBx — larissa nez (@canoecanoa) October 31, 2016

Near the end of the protest, a group of children brought a black snake into the Army Corps building.

According to an alert tweeted out before the event, the protest was staged at the Army Corps of Engineers office because "the Army Corps office in Portland is in fact the location that has the power to make the decision to stop the Dakota Access pipeline. The Portland and Seattle offices share employees and hold federal jurisdiction over the Missouri River."

The person who answered the phone at the Army Corps office acknowledged that the Portland office does hold jurisdiction over the Missouri River but said the decisions over the Dakota Access Pipeline are being made at the office in Omaha.

We reached out to the Omaha office but a call had not been returned at the time we published this story.

Mark Graves helped with this report.

-- Lizzy Acker

503-221-8052

lacker@oregonian.com, @lizzzyacker