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.

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.

Investigators late Thursday were still looking into what caused the crash through an afterschool program building in Chatham, Illinois, which left four girls dead. Sabrina Franza reports.