Seven officers were hurt. Some had broken bones, and one was unresponsive, said Capt Eric Kowalczyk. Television footage showed a police cruiser in flames and stores being overrun by small groups of people. Officers using shields and wearing helmets used pepper-spray in an effort to keep the rioters back.
A helicopter circled overhead as groups of rioters moved through the city yesterday. One group piled onto and rode a car as it drove down the street. Officers for the most part formed lines to keep protesters at bay.
Yesterday's riot was the latest flare-up over the mysterious death of 25-year-old Freddie Gray, whose fatal encounter with officers came amid the national debate over police use of force, especially when black suspects are involved. Gray was African-American.
Gray's family was shocked by the violence and was lying low; instead, they hoped to organise a peace march later in the week, said family attorney Billy Murphy. He said they did not know the riot was going to happen and urged calm.
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Police urged parents to locate their children and bring them home. Many of those on the streets appeared to be African-American youths, wearing backpacks and khaki pants that are a part of many public school uniforms.
The riot broke out just as high school let out, and at a key city bus depot for student commuters.
Many who had never met Gray gathered earlier in the day in a Baltimore church to bid him farewell and press for more accountability among law enforcement.
Police said in a news release sent while the funeral was underway that the department had received a "credible threat" that three notoriously violent gangs are now working together to "take out" law enforcement officers.