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WASHINGTON (WUSA9) -- Law enforcement officers who shot and killed the Navy Yard shooter will not face criminal charges for their actions.

Last September, Aaron Alexis, a Department of Defense contractor working at the Navy Yard opened fire killing 12 and wounding four before officers on the scene shot and killed him.

On Thursday, the U.S. Attorney's Office announced that an investigation concluded that the officers who fired at Alexis were acting in defense of themselves and others and acted reasonably at all times to neutralize a life-threatening situation.

The decision was made after a through review of witness statements, surveillance video and Alexis' autopsy report, the U.S. Attorney's office said.

In a statement announcing the decision, U.S. Attorney Ronald C. Machen Jr. said ""We concluded that the law enforcement officers involved demonstrated exceptional valor in acting to protect the lives of Navy Yard employees and other responding law enforcement officers."

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