More than 100 people were illegally riding bicycles, dirt bikes, and motorized scooters on Route 93 in Boston Saturday.

The group was first reported to police after 2 p.m. Saturday as they rode into the O’Neil Tunnel on Interstate 93 South via the Zakim Bridge. They took an exit to leave the highway at Government Center in Boston, but returned to the interstate a “short time later,” state police said in a statement.

Adam Harrison, 22, of Winthrop, tells Boston 25 News he was riding his pedal bike innocently and never rode on the highway or in the tunnel. He simply caught up with the group in the Seaport District and was in the back of the pack when he was arrested,