UPDATE 1-Police fire water cannon at Dakota pipeline protesters in freezing weather

(Adds additional comment from Standing Rock Sioux)

By Chris Michaud and Stephanie Keith

NEW YORK/CANNON BALL, N.D., Nov 21 (Reuters) - Police fired

tear gas and water at hundreds of protesters in the freezing

North Dakota weather late Sunday and early Monday, in the latest

violent clash over a pipeline project running through the state.

An estimated 400 protesters mounted the Backwater Bridge

just north of Cannon Ball, North Dakota, and attempted to force

their way past police in

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