Overview

• More than 100 cyclists, dirt-bike riders and scooter users boarded I-93 via the Zakim Bridge, passed through the O’Neill Tunnel and later entered the Seaport District.
• State Police tracked the group by helicopter and cruisers and urged the public not to approach or engage with the riders.
• A dirt bike collided with a State Police cruiser near D and Summer streets, its operator fled the scene and officials later confirmed the machine was stolen.
• Adam Harrison, 22, of Winthrop was arrested at the Seaport, arraigned on charges of disorderly conduct and resisting arrest, pleaded not guilty and was released on personal recognizance.
• MassDOT has withheld official tunnel video until the State Police investigation concludes, and officials say other participants in the highway incursion remain under active scrutiny.