The demonstration blocked traffic during the evening rush hour and there were  reports of assaults on police officers, according to the report. An off-duty police sergeant was reportedly punched as he got out of a car; another officer was reportedly hit in the head with a beer bottle.

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The march, organized by the Stop Mass Incarceration Network, started at Union Square about 2 p.m. and by 4:15 p.m. had spilled onto the Brooklyn Bridge, disrupting traffic for hours.