Police in Boston and several other communities in Eastern Massachusetts scrambled early Sunday morning to respond to numerous reports of “street takeovers” where large crowds shut down streets and drivers performed high-speed stunts as spectators watched and took video with their phones.

Two of the takeovers in Boston and Randolph involved direct attacks against police cars, officials said. No injuries were reported in those incidents, but a spectator was struck by a car at another meetup in Hyde Park and was taken to the hospital.

Governor Maura Healey has condemned the events and on Wednesday warned participants, saying that “anyone who engages in that conduct will be found and will be held accountable to the furthest extent of the law.”

Healey said she has directed the head of

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