After a car attempted to crash a gate outside the NSA Monday morning, Maryland state police blocked the freeway entrance that accesses the agency's headquarters in Fort Meade, Md. Patrick Semansky/AP hide caption

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Airplanes' contrails streak the sky close to where a Germanwings plane crashed last week, in Seyne les Alpes, France. Thomas Lohnes/Getty Images hide caption

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Ahead of Tuesday's deadline, Secretary of State John Kerry, Russian Foreign Minister Sergei Lavrov, German Foreign Minister Frank-Walter Steinmeier, French Foreign Minister Laurent Fabius and Chinese Foreign Minister Wang Yi wait Monday for the opening of a plenary session on Iran's nuclear program at the Beau-Rivage Palace Hotel in Lausanne, Switzerland. Fabrice Coffrini/AFP/Getty Images hide caption

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Survivors are escorted from the National Bardo Museum in Tunis on Wednesday. At least 20 foreign tourists were killed in the attack. Mohamed Krit/Barcroft Media/Landov hide caption

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Yes, those are people: A still image from a drone video filmed inside the world's largest cave shows cavers standing beneath one of two large skylights in Vietnam's Hang Son Doong. Ryan Deboodt /Vimeo hide caption

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Jarvis Summers of the Mississippi Rebels sits on the court in the closing seconds of his team's 17-point comeback win against Brigham Young during the first round of the 2015 NCAA Men's Basketball Tournament. Joe Robbins/Getty Images hide caption

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Secret Service Director Joseph Clancy testifies before a Homeland Security Subcommittee hearing on the Secret Service budget Tuesday, when he responded to sharp questions about misconduct by his agents. Jim Lo Scalzo/EPA /LANDOV hide caption

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Bhutanese football player Chencho Gyeltshen controls the ball in a March 5 match against Sri Lanka. The striker hit two goals Tuesday to lead Bhutan past Sri Lanka and into the next phase of World Cup Qualifying. Lakruwan Wanniarachchi/AFP/Getty Images hide caption

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