Protesters filled the streets after nightfall yesterday, and officers trying to enforce tighter restrictions at times used bullhorns to order them to disperse. Police fired tear gas and flash grenades, and deployed noisemakers and armoured vehicles to push demonstrators back.
Molotov cocktails and bottles were thrown from the crowd and some officers came under heavy gunfire, said Capt Ron Johnson of the Missouri Highway Patrol, who is in charge of security in Ferguson.
The latest clashes came after a day in which a pathologist hired by the family of Michael Brown's family said the 18-year-old suffered a bullet wound to his right arm that may indicate his hands were up or his back was turned. But the pathologist said the team that examined Brown cannot be sure yet exactly how the wounds were inflicted until they have more information.
Brown's August 6 slaying by a white officer has inflamed racial tensions in Ferguson, a predominantly black St Louis suburb where the police force is mostly white.
He tried to strike a balanced tone, calling for respect for police but also understanding of the plight of young black men who feel unjustly targeted by law enforcement.
"In too many communities, too many young men of colour are left behind and seen only as objects of fear," Obama said at the White House, while adding that crimes must be prosecuted and police honoured for doing their jobs.
The president said Attorney General Eric Holder would arrive tomorrow in Ferguson to meet with FBI and other officials carrying out an independent federal investigation into Brown's death.
The Justice Department has mounted an unusually swift and aggressive response to Brown's death, from the independent autopsy to dozens of FBI agents combing Ferguson for witnesses to the shooting.
