Canadian-born Omar Khadr is seen in a courtroom sketch during a 2010 hearing at the U.S. military prison at Guantanamo Bay, Cuba. He was moved to a Canadian prison in 2012. Janet Hamlin/AP hide caption

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Firefighters douse blazes after a freight train loaded with oil derailed in Lac-Mégantic in Canada's Quebec province on July 6, 2013, sparking explosions that engulfed about 30 buildings in fire. AFP/Getty Images hide caption

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Oregon Gov. Kate Brown smiles after signing an automatic voter registration bill on Monday in Salem, Ore. Seventeen years after Oregon decided to become the first state in the nation to hold all elections by mail ballot, it is taking another pioneering step to encourage more people to cast ballots, by automatically registering them to vote. Don Ryan/AP hide caption

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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

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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

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A duplex where a 19-year-old man was found dead is shown in Timberlea, Nova Scotia, on Friday. Royal Canadian Mounted Police say they foiled a plot to commit a mass shooting. Reuters/Landov hide caption

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The Supreme Court of Canada, seen here in a welcoming ceremony last October, has overturned the country's ban on physician-assisted suicide. Chris Wattie/Reuters/Landov hide caption

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Former CBC host Jian Ghomeshi was arrested Wednesday and charged with four counts of sexual assault and one count of overcoming resistance by choking. Sonia Recchia/Getty Images hide caption

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Russian President Vladimir Putin looks to his side during the family photo session of the G-20 summit in Brisbane, Australia, on Saturday. Putin was sternly criticized by Western leaders over Moscow's involvement in eastern Ukraine. Rob Griffith/AP hide caption

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A makeshift memorial sits on a downtown street a block away from Canada's National War Memorial in Ottawa to remember Canadian soldier Nathan Cirillo, who was shot and killed by an assailant Wednesday. Warren Toda/EPA/Landov hide caption

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A Canadian soldier who was shot outside the war memorial on Parliament Hill in tended to in Ottawa on Wednesday. Daniel Thibeaut/CBC/Reuters /Landov hide caption

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The Erebus and the Terror among icebergs, as illustrated in The Polar World by G. Hartwig in 1874. Sir John Franklin, British naval officer and arctic explorer, commanded the 1845 expedition of the ships to search for the Northwest Passage. All members of the expedition perished. G. Hartwig/Universal History Archive/Getty Images hide caption

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Toronto Mayor Rob Ford, seen here in December 2013, announced Friday that he was withdrawing his re-election bid to seek treatment for an abdominal tumor. Chris Young/The Canadian Press hide caption

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The Erebus and the Terror among icebergs, as illustrated in The Polar World by G. Hartwig in 1874. Sir John Franklin, British naval officer and arctic explorer, commanded the 1845 expedition of the ships to search for the Northwest Passage. All members of the expedition perished. G. Hartwig/Universal History Archive/Getty Images hide caption

itoggle caption G. Hartwig/Universal History Archive/Getty Images