Peoria Firefighters/Paramedics were called to a rollover accident at the intersection of Sheridan Road and Nebraska Avenue about 1:40 a.m. Thursday morning.
Crews found one vehicle on its top with three people inside.
The occupants were extricated from the vehicle within a matter of minutes.
Paramedics administered critical care to the patients on the scene before they were transported to area hospitals.
Peoria Police remained on the scene to investigate the crash.