Protests have erupted across New York and in US cities from Georgia to California after a white police officer was cleared over the chokehold death of an unarmed black man.
New York City police said more than 60 people have been arrested, most for disorderly conduct.
The decision on Wednesday by the Staten Island grand jury not to indict Officer Daniel Pantaleo heightened tensions that have simmered in the city since the July 17 death of Eric Garner.
The case has drawn comparisons with the deadly police shooting in Ferguson, Missouri.
A video shot by an onlooker shows the officer wrapping his arm around Mr Garner’s neck in what appears to be a chokehold, banned under NYPD policy.
The heavyset Mr Garner, 43, who had asthma, was heard repeatedly gasping: “I can’t breathe.” A second video surfaced that showed police and paramedics appearing to make no effort to revive him.