BOSTON — Chaos erupted on the Boston Common Tuesday night as a pro-Palestine protest spiraled into violence — leaving multiple cops injured, several in the hospital, and more than a dozen protesters in cuffs.

Police say the night turned ugly around 7 p.m. when the crowd spilled from the Common onto Tremont and Winter Streets, kicking a cruiser, blocking traffic, and lighting off smoke bombs that sent red clouds billowing through downtown.

WATCH: Boston Police storm in and push back a pro-Palestine mob on Boston Common after a police officer was reportedly pepper-sprayed in a chaotic downtown standoff.

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Thirteen people — eight men and five women — were arrested after the mob reportedly turned on officers. Four officers were hurt in the melee, with two rushed to the hospital for treatment. One BPD spokesperson said early reports suggested some officers suffered broken bones.

By 9 p.m., police said no one had yet been booked as the department processed the arrests. More details are expected Wednesday morning as officials assess the damage and brace for fallout from the downtown chaos.