Sanford police confirmed Monday they had delivered boxes of evidence from their investigation into George Zimmerman to the Federal Bureau of Investigation's Orlando office.
Capt. Jim McAuliffe said the delivery — which includes the gun Zimmerman used to fatally shoot Trayvon Martin — was shipped to the FBI at its request.
The U.S. Department of Justice, which includes the FBI, opened an investigation shortly after the unarmed black teenager's death more than a year ago but has not filed any criminal charges.
Zimmerman, a Neighborhood Watch volunteer, was found not guilty of second-degree murder earlier this month after killing the Miami Gardens 17-year-old during a Feb. 26, 2012, encounter inside a Sanford gated community.
Sanford police did not immediately arrest Zimmerman after he claimed he shot the teen in self-defense.
But Zimmerman's freedom incurred the anger of millions worldwide, sparking mass protests after the story caught fire in the national media.
He was arrested, charged and the subsequent trial led to his acquittal after 16 hours of deliberation by a six-member, all-female Seminole County jury.
Sanford police held onto the items — including Trayvon's clothes and cellphone, the bag of Skittles and soft drink found in his pockets — in a secure area before sending them to federal authorities.
National civil-rights leaders and demonstrators disappointed by the verdict called on the agency to investigate whether Zimmerman violated Trayvon's civil rights.
U.S. Attorney General Eric Holder pledged the Justice Department would continue its investigation and simultaneously work to ease tensions in the wake of the verdict.
Last week, DOJ officials solicited tips for their civil-rights investigation through a public email address now in operation, Sanford.firstname.lastname@example.org.
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