Niagara falls is frozen and tourists are flocking to see it

The deep freeze sweeping across the US has transformed Niagara Falls into an icy spectacle, encasing the trees around it into crystal shells and drawing tourists who are braving temperatures well below freezing.

The Niagara River keeps flowing below the ice cover, so the falls are not completely frozen over, but the massive ice build-up near the brink has become a tourist magnet for the second year in a row after several relatively mild winters.