Investigators believe speed and/or alcohol could be factors in an incident that sent the children to the hospital.

Thursday night near the intersection of Robert T. Longway and Dort Highway in Flint, a 51-year-old man driving a 2000 Oldsmobile Alero crashed into a MTA bus. There were three young girls, ages 3, 3 and 4, in the car who were not in any type of child safety restraints, according to WNEM TV 5 News. Two of the girls were sent to Hurley Medical Center in critical condition. The crash is still under investigation.