The 25 year-old unarmed Freddie Grey was arrested by Baltimore police on April 12 for possession of a switchblade. He died a week later on April 19 after suffering severe spinal cord injury.
His death, the latest involving an encounter between an unarmed black man and police officers, has set off protests, riots and looting in Baltimore.
Protesters gathered in Union Square to denounce the death of Gray and to criticize the tactics of the police in Baltimore, New York Times reported.
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"It's all about solidarity," Carmen Perez, a director of group that advocates criminal justice reform, Justice League, said during the Union Square rally. "We're here to spread the message of peace from Baltimore's initial protests."
US was rocked by protests last year also when black an 18-year-old black man Michale Brown was fatally shot by white policeman Darren Wilson in Ferguson on August 9, 2014.