More than 1,000 people protesting the Dakota Access pipeline have taken refuge in community centers and a casino on the Standing Rock Sioux Reservation since a powerful blizzard blew through their main camp.

High winds knocked down a large military-style tent in the Seven Council Fires encampment late Monday. The tent caught fire, which spread to two other tents.

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 Efrem John, a Dine Navajo from Shiprock, N.M., clears snow from his camp near the Standing Rock Sioux Reservation in North Dakota. (Scott Olson / Getty Images via LA Times)

Efrem John, a Dine Navajo from Shiprock, N.M., clears snow from his camp near the Standing Rock Sioux Reservation in North Dakota. (Scott Olson / Getty Images via LA Times)