UPDATE 2-Police fire water cannon at Dakota pipeline protesters in freezing weather

(Adds statement on timeline from company)

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 what the

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