D.C. Navy Yard Shooting: Scenes From the Tragedy

Thirteen people are dead including the gunman.

Let Us Pray - The White House announced that President Obama will attend a memorial service for the victims of the Washington Navy Yard shootings on Sunday. "The president will want to mourn the loss of these innocent victims and share in the nation's pain in the aftermath of another senseless mass shooting," White House spokesman Jay Carney said.(Photo: Alex Wong/Getty Images)

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A Tragedy in Washington, D.C. - Thirteen people dead after a gunman opens fire at the Washington Navy Yard in Washington, D.C. Take a look at a few scenes from the tragedy. (Photo: Alex Wong/Getty Images)

How It Started - On Monday morning, a gunman, who was later dentified as Aaron Alexis, 34, of Texas, sprayed fire on employees in the cafeteria and hallways of a building on the Washington Navy Yard. He was reported dead, according to the Associated Press, after a shootout with police who were responding to the tragedy. (Photo: Win McNamee/Getty Images)

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How It Started - On Monday morning, a gunman, who was later dentified as Aaron Alexis, 34, of Texas, sprayed fire on employees in the cafeteria and hallways of a building on the Washington Navy Yard. He was reported dead, according to the Associated Press, after a shootout with police who were responding to the tragedy. (Photo: Win McNamee/Getty Images)

1, 2, 3 Shooters? - A police helicopter circles around above the Washington Navy Yard searching for potentially two other possible gunmen wearing military-style uniforms. (Photo: Alex Wong/Getty Images)

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1, 2, 3 Shooters? - A police helicopter circles around above the Washington Navy Yard searching for potentially two other possible gunmen wearing military-style uniforms. (Photo: Alex Wong/Getty Images)

Building 194 - The shooting occurred on the Navy Yard in Building 194, where approximately 3,000 people work. Many of the building's employees are civilians, according to AP. (Photo: AP Photo/Jacquelyn Martin)

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Building 194 - The shooting occurred on the Navy Yard in Building 194, where approximately 3,000 people work. Many of the building's employees are civilians, according to AP. (Photo: AP Photo/Jacquelyn Martin)

Witness Speaks Out - "It was three gunshots straight in a row — pop, pop, pop. Three seconds later, it was pop, pop, pop, pop, pop, so it was like about a total of seven gunshots, and we just started running," said Patricia Ward, a logistics-management specialist, who was in the building's cafeteria. (Photo: AP Photo/Jacquelyn Martin)

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Witness Speaks Out - "It was three gunshots straight in a row — pop, pop, pop. Three seconds later, it was pop, pop, pop, pop, pop, so it was like about a total of seven gunshots, and we just started running," said Patricia Ward, a logistics-management specialist, who was in the building's cafeteria. (Photo: AP Photo/Jacquelyn Martin)

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The President Responds - The Washington Navy Yard is about four miles away from the White House. President Obama called the tragedy a "cowardly act." (Photo: Alex Wong/Getty Images)

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The President Responds - The Washington Navy Yard is about four miles away from the White House. President Obama called the tragedy a "cowardly act." (Photo: Alex Wong/Getty Images)

Terrorist Attack? - As for whether it may have been a terrorist attack, Mayor Vincent Gray said: "We don't have any reason to think that at this stage," according to the Associated Press. (Photo: AP Photo/Jacquelyn Martin)

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Terrorist Attack? - As for whether it may have been a terrorist attack, Mayor Vincent Gray said: "We don't have any reason to think that at this stage," according to the Associated Press. (Photo: AP Photo/Jacquelyn Martin)

Washington Navy Yard - Aaron Alexis, 34, opened fire Monday morning at the Washington Navy Yard on Sept. 16, 2013, killing 12. Alexis was a full-time Navy reservist based in Texas when he left service in 2011. He was killed by the police. —Naeesa Aziz, Britt Middleton and BET.com staff(Photo: Alex Wong/Getty Images)

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City on Lockdown - Employees come out from a bulding with their hands up after the shooting. Several parts of the city were put on lockdown, including the Senate. The Washington Nationals postponed their game. (Photo: Alex Wong/Getty Images) 

Airlifted Out of Danger - A U.S. Park Police helicopter removes a man in a basket from the Washington Navy Yard. (Photo: AP Photo/Jacquelyn Martin)

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Airlifted Out of Danger - A U.S. Park Police helicopter removes a man in a basket from the Washington Navy Yard. (Photo: AP Photo/Jacquelyn Martin)

Search by Water - Police boats patrol the water outside a building at the Navy Yard complex. (Photo: Win McNamee/Getty Images)

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Search by Water - Police boats patrol the water outside a building at the Navy Yard complex. (Photo: Win McNamee/Getty Images)