Norwalk Police Sgt. Lisa Cotto said the group was spotted at the top of the southbound Grist Mill on-ramp by a cruiser called to the scene by passersby just before 11:30 p.m. When the officer turned on his lights and siren, six cars sped away with their wheels spinning and burning out, causing blinding white smoke to billow behind them, Cotto said. The officer followed the cars, some of which pulled off at New Canaan Avenue, but lost track of five of them, Cotto said. The officer was able to keep up with a black 1999 Honda Civic and pulled the vehicle over shortly after it got off at the New Canaan Avenue exit of the connector, Cotto said. Inside the vehicle, the officer saw that the passenger seat and rear seat had been taken out in order to lighten the vehicle and make it faster, Cotto said.