LONDON, ONT. -- An early-morning crash Thursday in Huron East has left one person with serious injuries and another with life-altering injuries.

OPP say the three-vehicle collision, which involved a dump truck, happened on Huron County Road 86 between Brussels Line and Perth Road 178 at about 6:45 a.m.

They say the initial investigation determined two passenger vehicles collided head on.

Three occupants of the passenger vehicles were taken to a local hospital for treatment.

One of the drivers was taken to a London hospital with life-threatening injuries, which were later upgraded to serious injuries. A passenger in the vehicle was has life-altering injuries.

OPP says the investigation remains in the early stages.