The governor declared a state of emergency and called in the National Guard to restore order, and Attorney General Loretta Lynch, in her first day on the job, said she would send Justice Department officials to the city in coming days.
A week-long, daily curfew was imposed beginning today from 10 pm to 5 am, the mayor said. At least 15 officers were hurt, and some two dozen people were arrested. Two officers remained hospitalised, police said.
Officers wearing helmets and wielding shields occasionally used pepper-spray to keep the rioters back. For the most part, though, they relied on line formations to keep protesters at bay.
Yesterday's riot was the latest flare-up over the mysterious death of Freddie Gray, whose fatal encounter with officers came amid the national debate over police use of force, especially when black suspects are involved.
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Gray was African-American. Police have declined to specify the races of the six officers involved in his arrest, all of whom have been suspended with pay while they are under investigation.
Later yesterday night, mayoral spokesman Kevin Harris confirmed that a massive fire that had erupted in East Baltimore was also related to the riots. He said the Mary Harvin Transformation Center was under construction and that no one was believed to be in the building at the time.
The centre is described online as a community-based organisation that supports youth and families.
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.