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N.D. (AP) – Authorities in North Dakota have arrested 14 protesters of the Dakota Access pipeline whom they said refused to leave a wing of the Capitol in Bismarck.

The demonstrators were singing hymns Thursday afternoon in the judicial wing of the Capitol. Highway Patrol Lt. Tom Iverson says they face disorderly conduct charges for refusing to leave when asked.

Their protest followed an interfaith day of prayer in the southern part of the state near the small town of Cannon Ball. Hundreds of clergy sang hymns and marched near the route of the pipeline.

Members of the Standing Rock Sioux have demonstrated against the pipeline for months, saying they fear it could harm drinking water and construction could damage sacred sites.