Snopes reports
On 20 November 2016, the Dakota Access pipeline protests reached new proportions when an ongoing demonstration turned into a violent [assault on protesters by] law enforcement officials.
Pipeline protesters say 21-year-old Sophia Wilansky was critically injured when she was struck with a concussion grenade thrown by Morton County sheriff's deputies while she was handing out water. As a result, she has been hospitalized and now faces the prospect of having her left arm amputated.
On 21 November 2016, Wilansky's father, Wayne Wilansky, [...] told reporters that she may need as many as 20 surgeries and that, aside from her arm injury, Sophia had welts all over her body from being shot by rubber[-coated steel] bullets, and that it took hours for an ambulance to reach her because of roadblocks.
Heavy.com continues
A statement from The Standing Rock Medic & Healing Council stated:
"Sophia was heading to bring water to the unarmed people who were being attacked for several hours by Morton County Sheriff forces. The Morton County Sheriff's Department has stated that she was injured by a purported propane explosion that the Sheriff's Department claimed the unarmed people created."These statements are refuted by Sophia's testimony, by several eye-witnesses who watched police intentionally throw concussion grenades at unarmed people, by the lack of charring of flesh at the wound site, and by the grenade pieces that have been removed from her arm in surgery and will be saved for legal proceedings."
Snopes also notes:
A total of 26 protesters were hospitalized and more than 300 were injured.
Previously:
Water Cannons Used in Sub-Freezing Temperatures at Standing Rock
(Score: 2) by urza9814 on Tuesday November 29 2016, @11:26PM
But they're on *their own property*. The land, by treaty, is not owned by the United States government. It's a reservation. The police and the oil company are the ones who are trespassing.
And if the grenade is tampered with? For example I've seen a few images of such grenades that were apparently thrown while sealed with heavy black tape. I dunno if tape is enough to turn it into a frag grenade, but it seems plausible. Hopefully the fragments they recovered will explain exactly how that happened. The evidence seems pretty clear that it was an explosion, and with no burning it seems unlikely to be anything the protestors could have put together. But we know the police were definitely using weapons with that exact characteristic. The courts will decide, but I can't come up with any alternative explanation, and you don't seem to have any either...