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CANNON BALL, N.D. (AP) — Hundreds of clergy of various faiths joined protests Thursday against the Dakota Access oil pipeline in southern North Dakota, singing hymns, marching and ceremonially burning a copy of a 600-year-old document. The interfaith Unitarian Universalist Association said it organized the event to draw attention to the concerns of the Standing Rock Sioux and push elected officials to call for a halt to construction of the $3.8 billion pipeline that's to carry North Dakota oil through South Dakota and Iowa to a shipping point in Illinois. The tribe believes the pipeline that will skirt its reservation threatens its drinking water and cultural sites. The pipeline "is a textbook case of marginalizing minority communities in the drive to increase fossil fuel supplies," the Rev. Peter Morales, president of the association, said in a statement. More than 500 clergy from around the world gathered with protesters on Thursday at a campfire at the main protest camp to burn a copy of a religious document from the 1400s sanctioning the taking of land from indigenous peoples. About 200 people then sang hymns while they marched to a bridge that was the site of a recent clash between protesters and law officers. Some held signs that read, "Clergy for Standing Rock." "It's amazing the spirituality going around this place," said Joe Gangone, who came with an Episcopalian church group from South Dakota's Rosebud Sioux Reservation. The Rev. Tet Gallardo, a Unitarian Universalist minister from the Philippines, said she was "moved to come" to the gathering. "Water is the subject of concern also in the Philippines," she said. "How can this happen to people who are so faithful to God?" The group sang and prayed while gathered in a semicircle at the still-closed bridge while law officers monitored from vehicles at a barricade on the other side, from surrounding hillsides and from a helicopter flying overhead. John Slowberg, an Episcopalian minister from the Standing Rock Reservation, called for "peaceful, prayerful, nonviolent and lawful activity here." There were no immediate confrontations between group members and authorities, and no arrests, Morton County sheriff's spokesman Rob Keller said. Opponents of the pipeline project have been camped near the route in southern North Dakota for months in an effort to stop construction. Clashes between protesters and police have resulted in more than 400 arrests since August. The most recent incident came Wednesday, when law officers in riot gear used pepper spray to deter dozens of protesters who tried to cross a frigid stream to access property owned by the pipeline developer. Two people were arrested. About 140 people were arrested on the property last week in a law enforcement operation that cleared the encampment that protesters had established on the land. Texas-based developer Energy Transfer Partners has said the 1,200-mile pipeline is largely complete outside of the area in south central North Dakota where it will go under Lake Oahe, a large Missouri River reservoir and the source of the tribe's drinking water. The federal government in September ordered a temporary halt to construction on Army Corps of Engineers land around and beneath the lake while the agency reviews its permitting of the project. There's no timetable for a decision.

Clergy join Dakota Access pipeline protesters for ceremony