NIAGARA FALLS, N.Y. (AP) - A 33-year-old mother climbed over a safety rail and intentionally went over Niagara Falls with her two children, a 9-year-old and 5-month-old, according to New York state police, who said Wednesday that search and rescue efforts were unsuccessful. Authorities responded to the park around 9 p.m. Monday and determined the family went over the rail on Luna Island, a small island between the American Falls and Bridal Veil Falls that, along with the Horseshoe Falls, make up