A 21-year-old woman was severely injured and may lose her arm after being hit by a projectile when North Dakota law enforcement officers turned water cannon on Dakota Access pipeline protesters and threw “less-than-lethal” weapons.

Sophia Wilansky was one of several hundred protesters injured during the standoff with police on Sunday on a bridge near the site where the pipeline is planned to cross under the Missouri river.

Graphic photographs of her injured arm with broken bones visible were circulated on social media.

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