Eight people were taken to hospital following a single vehicle collision east of Chatham.
Emergency crews responded to Kent Bridge Road near Fairview Line shortly before 7 Sunday morning.
Investigators say the vehicle was heading east on Fairview Line when it missed a stop sign at Kent Bridge and crashed into a ditch on the opposite side of the road.
All eight occupants were taken to the Chatham-Kent Health Alliance. Four victims were later air-lifted to receive further treatment at London Victoria Hospital and Windsor Reginal with serious injuries.
The Traffic Management Unit continues to investigate. Anyone with information is asked to contact Constable Josh Flikweert at joshuaf@chatham-kent.ca or 519-355-1092.