There have been long-standing concerns for the Standing Rock demonstrators that have been simmering for some time now and have not abated even when President Obama declared there should be a pause in the development of the Dakota Access Pipeline.
See, on the one hand there was the judge who denied the Standing Rock Sioux tribe's request for an injunction and therefore declared that the Dakota Access pipeline construction could legally proceed, and the other where the U.S. federal government then stepped in and temporarily halted the project.
One of the key concerns is demonstrating in the middle of winter, which was the all too familiar cause of most Occupy camps shutting down as temperatures dropped.