Deputy Chief Mark Saunders speaks at a news conference in Toronto on Tuesday. A mysterious tunnel discovered in Toronto near one of the venues for this summer's Pan American Games contained a rosary with a crucifix and poppy. Police said there is nothing to suggest the tunnel was linked to criminal activity. Aaron Harris/Reuters/Landov hide caption

itoggle caption Aaron Harris/Reuters/Landov

A partially frozen American Falls in sub-freezing temperatures is seen in Niagara Falls, Ontario, on Tuesday. Temperature dropped to 6 degrees Fahrenheit on Tuesday. The National Weather Service has issued a wind chill warning for western New York from midnight Wednesday to Friday. Lindsay DeDario/Reuters/Landov hide caption

itoggle caption Lindsay DeDario/Reuters/Landov

Trucks move containers at the Port of Long Beach in California on Tuesday. Contract negotiations between dockworkers and shipping companies have led to a slowdown on the piers. Jae C. Hong/AP hide caption

itoggle caption Jae C. Hong/AP

In this photo provided by Britain's Royal Air Force, taken Oct. 29, 2014, a Russian military long-range bomber aircraft photographed by an intercepting RAF Typhoon flies in international airspace. Robyn Stewart/AP hide caption

itoggle caption Robyn Stewart/AP

Singer Conchita Wurst, representing Austria, performs the song "Rise Like a Phoenix" during the final of the Eurovision Song Contest in Copenhagen, Denmark. Wurst, who won the competition, placed seventh on Google's list of 2014's fastest-rising global search requests. Frank Augstein/AP hide caption

itoggle caption Frank Augstein/AP