It was just before 7:30 saturday evening that authorities say the driver of a vehicle carrying three passengers had an accident about a half mile up this rural road just outside Avon.
Two were killed in the accident, two others sent to area hospitals.
Fulton county sheriff's deputies were dispatched to a one vehicle accident on Roberts Road Saturday evening.
Police have had the rural road blocked of since that night.
A release issued by the Fulton County Sheriff's Department says preliminary investigations show the car was speeding west bound on the road when the driver lost control and veered off.
The vehicle hit a utility pole, went air-born, and rolled numerous times before coming to a stop.
Authorities say three of the passengers were thrown from the vehicle.
Fulton County Deputy Coroner, Kevin Peterman says 15-year-old, Rachel Anderson from Avon and 15-year-old Anissa Morgan from Racine, Wisconsin were pronounced dead at the scene.
The 16-year-old driver, Meagan Markley was Lifeflighted to OSF St. Francs Medical Center, and a 14-year-old male passenger was initially taken to OSF St. Mary Medical Center in Galesburg.
Markley's grandparents, Marge and Frank Markley say news of the accident was shocking.
Meagan Markley's Grandmother Marge Markley says, "Unbelievable. I haven't eaten, I haven't slept. I'm just..numb."
Meagan Markley's Grandfather Frank Markley says, "You read about it in the paper everyday, but you don't realize until it hits home how bad it is."
The Markleys say their granddaughter is a high school sophomore who had just returned to Avon after being out-of-state for several months.
Due to age, they haven't made the trip to see her at the Peoria hospital, but they sit by the phone waiting for word on Meagan's condition.
The Fulton County Sheriff's Department is working with Illinois State Police to reconstruct the accident scene and figure out just what happened here on Saturday evening.