UPDATE | Pathologist says Michael Brown may have had his hands raised

FERGUSON, Mo. (AP) — An unarmed 18-year-old whose fatal shooting by police has sparked a week of protests in suburban St. Louis suffered a bullet wound to his right arm that may indicate his hands were up or his back was turned, a pathologist hired by his family said today.

But the pathologist said the team that examined Michael Brown can't be sure yet exactly how the wounds were inflicted, citing the need for more information.

An independent autopsy determined that Michael Brown was shot at least six times, including twice in the head, the family's lawyers and hired pathologists said.

Witnesses have said Brown's hands were above his head when he was repeatedly shot by an officer Aug. 9 in Ferguson.

In Washington, President Barack Obama said the vast majority of protesters in Ferguson were peaceful, but warned that a small minority was undermining justice.

During a brief pause in his summer vacation, Obama said overcoming the mistrust endemic between many communities and their local police would require Americans to "listen and not just shout."

The president also weighed in for the first time publicly on the militarization of some local police departments, saying it would probably be useful to examine how federal grant dollars had been used to allow local police to purchase military-style equipment.