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Family attorney Benjamin Crump said the family would not release copies of the report.

Preliminary results from an autopsy performed by the St. Louis County medical examiner’s office showed Mr. Brown died of gunshot wounds.

Mr. Nixon, who spoke with Mr. Obama on Monday, ordered the deployment of the National Guard to the St. Louis suburb in an attempt to de-escalate the situation. He also lifted a midnight-to-5 a.m. curfew that began Saturday night.

Many of the protesters ignored the curfew, and the restrictions did not prevent angry standoffs with police.

Several black groups such as the Nation of Islam and the New Black Panther Party called for calm Monday. They asked specifically that protesters clear the streets at sunset as the National Guard arrived — a state move that the groups nevertheless condemned.

State officials and the U.S. Department of Justice are investigating the shooting, and more than 40 FBI agents are in Ferguson interviewing witnesses. Some witnesses said Mr. Brown had his hands up and was surrendering to authorities when he was shot.

Some in the community have called for the officer who shot Mr. Brown, Darren Wilson, to be charged with murder.

Though accounts of the circumstances that led up to the shooting have been conflicting, the image of a young black man being shot to death by a white police officer has stoked racial tensions in the largely black suburb of Ferguson and across the country.

Mr. Obama tried Monday to grapple a bit with the broader questions over race that the shooting had exposed when asked whether he felt he could do more personally for communities like Ferguson where such tensions between residents and local law enforcement might be simmering beneath the surface.

The president said helping communities with such tensions always has been an issue for the country. Giving a nod to all sides of the thorny issue, he said young minority men in some communities are more likely to end up in jail than they are in a good job or college, but regardless of the reasons why they get there, they need to be prosecuted if they commit a crime.

“What is also true is that given the history of this country, where we can make progress in building up more confidence, more trust, making sure that our criminal justice system is acutely aware of the possibilities of disparities in treatment, there are safeguards in place to avoid those disparities, where training and assistance is provided to local law enforcement who may just need more information in order to avoid potential disparity,” he said.

Police said they are trying to show more restraint after coming under heavy criticism for the use of military-style force in the streets and efforts to frame Mr. Brown as a villain. Police over the weekend released video footage suggesting that Mr. Brown robbed a convenience store just before he was confronted by Officer Wilson.