A group of over 100 bicycles, dirt bikes and motorized scooters were seen riding on and through highways and tunnels in Boston Saturday afternoon, police said. Massachusetts State Police received a report that a group of bikes was riding into the O'Neill Tunnel on Interstate 93 south just after 2 p.m. The group left the highway at Exit 17 but returned to the highway shortly after. One of the dirt bikes, which police later found to be stolen, collided with a state police cruiser after the group encountered troopers near D and Summer streets in Boston. The dirt bike operator...