A Pittsburgh driver has been arrested in Petaluma after hitting a fire hydrant. Police responded to the area of Petaluma Blvd South and Crystal Lane after a resident reported a suspected collision early Saturday morning. Police arrived to find a unoccupied vehicle that had struck a fire hydrant. They followed a blood trail from the vehicle and found two people with moderate injuries. They would be treated at a local hospital with the driver, 25 year old Christian Rodriguez, arrested for DUI and felony Hit and Run. He was also arrested for possession of a loaded firearm in a vehicle after officers found a loaded handgun inside the vehicle.