The protest in Brooklyn over ex-officer Peter Liang's manslaughter conviction in the 2014 shooting of Akai Gurley was one of about 30 taking place around the US, organizers said.
About 2,000 people marched in Philadelphia, according to Philly.Com, and about 150 gathered in Ann Arbor, Michigan, according to The Ann Arbor News.
"No scapegoat! No scapegoat!" protesters in New York shouted as the crowd descended on Cadman Plaza, just outside the federal courthouse in Brooklyn. They carried signs declaring Liang's prosecution "selective justice."
He testified that the shooting was an accident, and that he fired his gun after being frightened by a noise.
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Many of his supporters say they believe Liang is being scapegoated because of anger over other police shootings in New York and across the country and that he has been treated unfairly because he is Asian-American.
Prosecutors argued that Liang's actions were reckless and he shouldn't have had his gun out or his finger on the trigger. They also said he did nothing to help Gurley as he lay dying on the floor.
A few dozen people held a counter-protest in New York yesterday, held across the street from the larger protest as officers with plastic handcuffs and batons stood between them.
Soraya Soi Free participated in the counter-protest. She argued that Liang was clearly not a scapegoat because he was tried by a jury of his peers, and she did not approve of the protest supporting him.
Liang was convicted February 11 on manslaughter and official-misconduct charges. He is scheduled to be sentenced April 14.
Liang's attorney, Robert Brown, attended the Brooklyn rally and said the community's support was "very uplifting" to Liang. Brown said he is making motions to have the verdict set aside.