PHOENIX (AP) -- The sole person in a vehicle headed westbound on a Sun City street died Saturday morning when the driver collided with another vehicle. Maricopa County sheriff's spokesman Officer Christopher Hegstrom says the westbound vehicle burst into flames. He says witnesses told authorities that the collision happened when the driver of the westbound vehicle ran a red light. The driver of the other vehicle refused medical treatment. Hegstrom says authorities are working to identify the deceased driver.