More than 1,000 people joined an orderly 90-minute rally at Baltimore city hall last night demanding justice for Freddie Gray, who died last Sunday from spinal injuries, a week after his arrest in the city's impoverished west side.
But the mood shifted dramatically when several scores of protesters moved on to the Camden Yards baseball stadium, an hour before the scheduled start of a Baltimore Orioles-Boston Red Sox game.
Live images from local television news helicopters showed a youthful crowd hurling soda bottles and trash cans at police officers alongside the Sports Legends museum and Camden Yards ticket booths.
Others were seen smashing shop windows and blocked intersections, with one motorist getting a rock through her car window, CBS affiliate WBAL reported.
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Five police cars were seen by an AFP photographer getting their windows smashed, before riot police moved in.
Tensions have been simmering in the blue-collar Mid-Atlantic port city of 620,000 as investigators try to establish the circumstances that led to Gray's death.
Speakers at the city hall rally called for President Barack Obama to launch a national inquiry into police misconduct, following a series of fatal confrontations between white police officers and African-American men and boys.
In a press conference Friday, officials acknowledged Gray should have received medical help at the moment of his arrest, when he was seen by bystanders -- and caught on video -- howling in apparent pain.
They also revealed that Gray, contrary to police department policy, was not buckled into his seat in the van, which made at least three unexplained stops on its way to the Western District police station.
Six officers have been suspended with pay as the police investigation inches closer to a May 1 deadline to submit findings to a Maryland state prosecutor, who could decide to press charges.