Razor wire and concrete barriers protect access to the Dakota Access pipeline drilling site Thursday, Feb. 9, 2017 near Cannon Ball, North Dakota. The developer says construction of the Dakota Access pipeline under a North Dakota reservoir has begun and that the full pipeline should be operational within three months. One of two tribes who say the pipeline threatens their water supply on Thursday filed a legal challenge asking a court to block construction while an earlier lawsuit against the pipeline proceeds. (AP Photo/James MacPherson)
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