Police say the driver of a car that barreled through a building used for a popular after-school camp in central Illinois, killing three children and a teenager, may have had a medical emergency.

Illinois State Police said the driver who crashed into a building housing an after-school program in Chatham, Illinois, killing four, was not intoxicated at the time of the crash.

Illinois State Police released preliminary toxicology results that showed no drugs or alcohol in the system of a driver who crashed into a central Illinois after-school program, killing four young girls.