The Justice Department already had deepened its civil rights investigation into the shooting.
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Attorney General Eric Holder on Sunday ordered a federal medical examiner to perform another autopsy on a black Missouri teenager whose fatal shooting by a white police officer has spurred a week of rancorous and sometimes-violent protests in suburban St. Louis.

The “extraordinary circumstances” surrounding the death of 18-year-old Michael Brown and a request by Brown’s family members prompted the order, Department of Justice spokesman Brian Fallon said in a statement.