At 12:47am, Katonah Fire was dispatched along with KBHVAC and 45 Medics to Route 35 in the area of Mount Holly Rd. for a motor vehicle accident with unknown injuries. Car 2212 arrived on location reporting a single vehicle rollover with negative entrapment. Upon additional investigation, Car 2212 found a second vehicle involved about 500 feet down the road with heavy front end damage. 2213 and Rescue 17 arrived on location providing EMS support and stabilizing the vehicles. Units operated for over an hour at the MVA. While operating, Rescue 17, Engine 115, and Car 2212 responded to a Carbon Monoxide incident two houses down from the MVA. Units cleared both calls around 2:15am.