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Baltimore — Baltimore's top police officials, mayor and prosecutor sought to calm a "community on edge" Monday while investigating how a man suffered a fatal spine injury while under arrest. Six officers have been suspended, but investigators say they still don't know how it happened.

A week after the arrest of Freddie Gray, police said still don't have any videos or other evidence explaining what happened to cause the "medical emergency" that an arresting officer said Gray suffered April 12 while being taken to the local police station, Deputy Commissioner Jerry Rodriguez said.

Autopsy results returned Monday show that Gray "did suffer a significant spinal injury that led to his death," Rodriguez said. "What we don't know is how he suffered that injury."

A police timeline revealed that Gray was placed in leg irons after an officer felt he was becoming "irate," that the van made several stops on its way to the police station, even stopping to pick up another prisoner in an unrelated case, after Gray had asked for medical attention several times.

Something must have happened between the time Gray was videotaped by a bystander being dragged into the van, and the time he arrived at the station in deep distress, the deputy commissioner said.

"When Mr. Gray was put in that van, he could talk, he was upset. And he was taken out of that van, he could not talk and he could not breathe," Rodriguez said.

Police Commissioner Police Commissioner Anthony Batts said he is ordering that police review and rewrite "effective immediately" its policies on moving prisoners and providing them with medical attention.

"We are a community on edge right now. We hear, I hear, the outrage. I hear the concern and I hear the fear," Batts said, asking for calm. 'We are on edge as a city, and I need your help . . ."

Officer Garrett Miller's official request for a criminal charge against Gray, a 25-year-old black man who was only 5-foot-8 inches tall and 145 pounds, said that he had been arrested "without force or incident."

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