Another pipeline fight brewing in South Dakota

EAGLE BUTTE, S.D. (AP) – American Indian tribes have written letters to South Dakota's Public Utilities Commission, expressing their opposition to the proposed Keystone XL oil pipeline.

The Cheyenne River Sioux Tribe, the Yankton Sioux Tribe and a grassroots group called Dakota Rural Action wrote letters seeking more information about developer TransCanada's compliance with permit conditions.

The tribes say ground-disturbing activity near the Cheyenne River Sioux Reservation and the Rosebud Sioux Reservation prompted the letter. It says that if TransCanada's actions are found to be unlawful, the commission should order that construction be stopped.

The tribe says the pipeline would run through Great Sioux Nation homelands.

A TransCanada spokeswoman has said previously that its site near the reservation is a pipe yard, one of four being prepared in South Dakota before planned construction next year.