Partially frozen Niagara Falls

Reuters
Partially frozen Niagara Falls

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The polar vortex that has gripped the U.S. and Canada this week has led to some spectacular icy images. The latest come from Niagara Falls, which partially froze on Tuesday, when the high temperature was a record low of minus 2 degrees.

The ice formed on the U.S. side of the falls, which straddle the border between the United States and Canada.

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