NIAGARA FALLS, Ontario -- Authorities say a woman is presumed to have drowned after being swept over Niagara Falls when she fell from a railing along the Canadian side of the Niagara River.Niagara Parks Police in Ontario say two female students in their 20s from the Toronto area were visiting the falls around Sunday night when one of them climbed onto a railing near the river's edge and sat on a block pillar, with her legs straddling the railing.Read More... More on Nature