A protest of a four-state, $3.8 billion oil pipeline turned violent Saturday after tribal officials said construction crews destroyed American Indian burial and cultural sites on private land in southern North Dakota. Morton County Sheriff’s Office spokeswoman Donnell Preskey said four private security guards and two guard dogs were injured after several hundred protesters confronted construction crews at the site just outside the Standing Rock Sioux reservation. One of the security officers was taken to a Bismarck hospital for undisclosed injuries. The two guard dogs were taken to a Bismarck veterinary clinic, Ms. Preskey said. Tribe spokesman Steve Sitting Bear said protesters reported that six people were bitten by security dogs, including a young child. At least 30 people were pepper-sprayed, he said. Ms. Preskey said law-enforcement authorities had no reports of protesters […]