BALTIMORE — Prosecutors here, in an unexpected announcement, said Friday they have filed homicide, manslaughter and misconduct charges against police officers in the death of Freddie Gray, who died after sustaining a spinal cord injury while in police custody.

In a news conference, the state’s attorney in Baltimore, Marilyn J. Mosby, described repeated mistreatment of Mr. Gray. Time and again, she said, officers abused him, arresting him without grounds and violating police procedure by putting him in handcuffs and leg restraints in the van without putting a seatbelt on him.

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