A 12-year-old boy has been airlifted to hospital with critical injuries after a serious multi-vehicle crash on the QEW in Mississauga.

The crash involved four or five vehicles and unfolded on the westbound Queen Elizabeth Way shortly before 11 a.m.

Ontario Provincial Police say all westbound lanes are closed at Cawthra Road while crews tend to the scene.

Images from the scene also show a transport truck with a damaged front end.

“My understanding is that traffic was beginning to slow. One of the vehicles failed to do so, was involved in a collision with another vehicle and that triggered a chain reaction collision with other vehicles, including a transport truck, which then lost control and struck several other vehicles,” OPP Sgt. Kerry Schmidt told CP24 via phone.

“We will be looking into weather conditions, road conditions, driver actions and everything.”

ORNGE says they airlifted a 12-year-old boy to SickKids Hospital in critical condition.

Meanwhile, Peel Paramedics say six other victims – three adults and three children -- were all transported to a nearby hospital with minor injuries.

Some of the patients needed to be extricated from the vehicles as well, they said.

Schmidt said the portion of the highway will likely remain closed for several hours.

“We are just working with the witnesses here and our collision reconstruction team and traffic support unit members are doing their work,” he said.

“We are going to do our part here to collect the evidence and come up with some answers to families and to those involved so they can move forward.”