Why are police using bean bag rounds? APA answers

APA explains that police use bean bag rounds, pepper spray, and "less than lethal" munitions in order to keep protesters from throwing debris like rocks, bottles, and other dangerous items at police. 

Fresh protests rock New York City after mayor pleads for calm

Street protests spiraled into New York City’s worst day of unrest in decades Saturday, as fires burned, windows got smashed and dangerous confrontations between demonstrators and officers flared amid crowds of thousands decrying police killings.

NYPD officers, cruisers targeted by protesters

Two NYPD cruisers drove into protesters in Brooklyn on Saturday who were pelting, pushing barricade against a police car, knocking several people to the ground as the officers tried to evacuate the area.  It was just one incident involving NYPD officers on Saturday that left officers injured, vehicles destroyed, and scores of protesters under arrest.