Illinois State Police said the driver who plowed into a building housing an after-school program in downstate Chatham, Illinois, that killed three children and one teenager, was not intoxicated at the time of the crash.

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.

The driver of the vehicle involved in the crash that killed three children and a teenager may have had a medical emergency, according to law enforcment officials.