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An image released by the FBI shows Aaron (Credit: EPA)

An image released by the FBI shows Aaron Alexis arriving at the Navy Yard as his rampage began in Washington, DC. (Sept. 16, 2013)

Images of the Navy Yard shooter

The FBI released surveillance video and images of Navy Yard shooter Aaron Alexis. Alexis did not target individuals when he opened fire, the FBI said.

This image taken from security cameras and released
(Credit: Getty Images)

This image taken from security cameras and released by the FBI, shows Washington Navy Yard shooter Aaron Alexis moving through the hallways of Building #197 carrying the Remington 870 shotgun. (Sept. 16, 2013)

This image taken from security cameras and released
(Credit: Getty Images)

This image taken from security cameras and released by the FBI, shows Washington Navy Yard shooter Aaron Alexis moving through the hallways of Building #197 carrying the Remington 870 shotgun. (Sept. 16, 2013)

In this image released by the FBI, the
(Credit: Getty Images)

In this image released by the FBI, the etching reading, "Not what y'all say!" is visible on the right side of Aaron Alexis' shotgun receiver. The FBI investigation indicates that Alexis believed he was being controlled by extremely low frequency (ELF) electromagnetic waves when he carried out his attack. (Sept. 16, 2013)

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In this handout frame grab from the Washington
(Credit: Getty Images)

In this handout frame grab from the Washington Navy Yard provided by the FBI, Aaron Alexis enters Building #197 at 8:08 a.m. carrying a backpack. Alexis had legitimate access to the Washington Navy Yard as a result of his work as a contractor, and he used a valid pass to gain entry to the building. (Sept. 25, 2013)

Special Agent in Charge of the Washington Field
(Credit: Getty Images)

Special Agent in Charge of the Washington Field Division of the Bureau of Alcohol, Tobacco, and Firearms Carl Vasilko speaks on the Navy Yard shooting during a briefing outside the FBI Field Office in Washington, DC. Also pictured from left to right are Special Agent in Charge of the Washington Field Office of the Naval Criminal Investigative Service Michael T. Monroe; Valerie Parlave, assistant director in charge of the FBI Washington Field Office; Washington Police Chief Cathy Lanier and U.S. Attorney for the District of Columbia Ronald C. Machen, Jr. (Sept. 25, 2013)

In this image released by the FBI is
(Credit: Getty Images)

In this image released by the FBI is Aaron Alexis' Remington 870 shotgun with a sawed-off barrel and stock. Etching on the right side of the shotgun receiver read "Not what yall say!" (Sept. 16, 2013)

In this image released by the FBI, Aaron
(Credit: Getty Images)

In this image released by the FBI, Aaron Alexis moves through the hallways of Building #197 carrying the Remington 870 shotgun. (Sept. 16, 2013)

An image released by the FBI shows Aaron
(Credit: EPA)

An image released by the FBI shows Aaron Alexis arriving at the Navy Yard as his rampage began in Washington, DC. (Sept. 16, 2013)

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An image released by the FBI shows Aaron
(Credit: EPA)

An image released by the FBI shows Aaron Alexis arriving in a Toyota Prius at the Navy Yard as his rampage began in Washington, DC. (Sept. 16, 2013)

This image, taken from security cameras and released
(Credit: Getty Images)

This image, taken from security cameras and released by the FBI, shows Washington Navy Yard shooter Aaron Alexis moving through the hallways of Building #197 carrying the Remington 870 shotgun. Twelve people were killed in the shooting. (Sept. 16, 2013)

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