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The Metropolitan Police Department’s Internal Affairs Division is investigating Carey’s death, but the U.S. attorney’s office will make the final determination as to whether the shooting was an appropriate use of lethal force, according to Metropolitan Police spokeswoman Gwendolyn Crump.

The Secret Service and Capitol Police also are conducting internal investigations involving their protocols.

Mr. Adler said the Secret Service findings would be referred to the Department of Homeland Security’s Office of Inspector General and then to the Department of Justice for review.