Actor Mark Ruffalo in North Dakota to oppose oil pipeline

BISMARCK, N.D. (AP) — Actor-activist Mark Ruffalo has traveled to North Dakota to support the Standing Rock Sioux tribe's opposition to the four-state Dakota Access oil pipeline.

The Standing Rock Sioux and other tribes and environmental groups say that the pipeline could threaten water supplies for millions, since it will cross the Missouri River, as well as harm sacred sites and artifacts.