The Metro in the nation's capital, was hobbled after an electrical malfunction filled a L'Enfant Metro subway station with smoke on Jan. 13, 2015, killing one woman and sending dozens of people to hospitals. Pablo Martinez Monsivais/AP hide caption

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A man holds a banner that reads in Spanish "Justice," during a march by parents and relatives of 43 missing students who were killed, in Iguala, Mexico. Rebecca Blackwell/AP hide caption

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Pauline Cafferkey is now in isolation at the Royal Free Hospital in North London, where she was treated in January for Ebola. Justin Tallis/AFP/Getty Images hide caption

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Members of the Mexico team celebrate a 4-2 win against the United States in the CONCACAF Gold Cup soccer final at the Rose Bowl in Pasadena, Calif., June 25, 2011. Jae C. Hong/AP hide caption

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December 2013: A Tunisian boy waves a flag as he runs at a rally in Tunis, marking the third anniversary of Tunisia's revolution. A prominent member of the group that's credited with averting civil war in the country says the group acted "to give hope to young people." Zoubeir Souissi /Reuters /Landov hide caption

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California's new digital privacy law essentially requires a warrant before any business turns over any of its clients' metadata or digital communications to the government. Hailshadow/iStockphoto hide caption

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House Majority Leader Rep. Kevin McCarthy, R-Calif., leaves after a closed House Republican election meeting to pick the next GOP House speaker nominee on Thursday in Washington, D.C. Alex Wong/Getty Images hide caption

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Fighters from the Islamic State group parade in Raqqa, northern Syria. The U.S. is considering arming Arab and Kurdish fighters who are poised to attack the Islamic State stronghold. Uncredited/AP hide caption

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Photos of victims of the mass shooting at Umpqua Community College in Roseburg, Ore., are displayed behind Portland Police Sgt. Peter Simpson (left) and Douglas County Sheriff John Hanlin. Rich Pedroncelli/AP hide caption

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Nuns of the Missionaries of Charity pray last month at the Mother House, the Missionaries' head office, in Kolkata, India. Dibyangshu Sarkar/AFP/Getty Images hide caption

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Diego next to posters of his brother Jose. The agent involved in Jose's death will be the first ever charged with murder for a cross-border shooting. John Burnett/NPR hide caption

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New Orleans Chef Paul Prudhomme prepares barbecue shrimp at the annual White House Congressional Picnic in 2007. Marvin Joseph/Washington Post/Getty Images hide caption

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