Some Indian leaders in Wyoming say they object to the state's decision to send six Highway Patrol troopers to North Dakota to help authorities there deal with Indian protesters opposing construction of an oil pipeline.

Col. Kebin Haller of the Wyoming Highway Patrol says six troopers went to North Dakota on Saturday October 22nd, and plan to return November 8.

Haller says the troopers volunteered after the governor of North Dakota declared an emergency and asked other states for law enforcement assistance.

More than 100 protesters were arrested over the weekend in Morton County, North Dakota, in the faceoff between protesters and Texas-based Energy Transfer Partners, developer of the four-state Dakota Access oil pipeline.

The Eastern Shoshone and Northern Arapaho tribes in Wyoming have expressed support for the protesters.