The federal Bureau of Indian Affairs is sending agents to North Dakota to help clear Dakota Access oil pipeline protesters from makeshift camps on the Standing Rock Sioux Reservation.

The Standing Rock tribe led the months-long protest against the pipeline project, but recently requested BIA’s assistance in closing the camps, Prairie Public Broadcasting reported Friday.

BIA’s announcement comes after the Army Corps of Engineers issued an order to a few hundred protesters at a camp in Cannon Ball, N.D., to get out by Feb. 22, the station reported.

BIA’s Acting Assistant Secretary for Indian Affairs Michael Black said on Friday that closing the camps is a matter of public health and safety.

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“North Dakota Gov. Burgum, the Standing Rock Sioux Tribe leadership, local law enforcement, and local landowners have all warned the public and those still camped of the dangerous spring flooding expected due to the heavy amount of snowfall the state received this winter,” Black said.

Authorities arrested 74 protesters, including American Indian activist Chase Iron Eyes, after they set up teepees Wednesday on land owned by Texas-based pipeline developer Energy Transfer Partners. Protesters said they were peacefully assembling on land they believe rightfully belongs to American Indians.

President Donald Trump last month called on the Army to reconsider its earlier decision to block the pipeline from being laid under Lake Oahe. It's the last big chunk of construction for the pipeline, and work has stalled while ETP battles the Army Corps of Engineers in court for permission to proceed.

Acting Army Secretary Robert Speer on Tuesday ordered a review of the Army's earlier decision not to grant permission until more study was done. It's unclear how long the review will take, but U.S. Sen. John Hoeven told the AP that after a conversation with Speer, he's certain permission will be granted soon.

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"The fight is no longer here, but in the halls and courts of the federal government," Standing Rock Sioux tribal Chairman Dave Archambault said.

The Dakota Access pipeline would carry oil from North Dakota to Illinois. Opponents fear it could harm the environment and American Indian artifacts. The pipeline developer disputes that.

The Associated Press contribued to this report.