All westbound lanes of Highway 401 are shut down in Milton after a multi-vehicle collision.

OPP Sgt. Kerry Schmidt says roughly 15 passenger vehicles and seven transport trucks were involved in the crash that happened shortly after noon Wednesday, just west of Highway 25.

“If you are travelling westbound you want to get off before you hit Highway 25. We have tows on scene but we need heavy tows,” said OPP Sgt. Kerry Schmidt in a periscope video.

#Hwy401 WB all lanes blocked west of #Hwy25 due to multi vehicle collision. 20+ vehicles involved pic.twitter.com/qFH8ThKBsV

— Sgt Kerry Schmidt (@OPP_HSD) February 13, 2019

Video from the scene shows a long backlog of vehicles behind the massive crash and several tow trucks lined up on the shoulder.

“We’re not even able to get to the front of the scene obviously because of the jam up of traffic,” said Schmidt. “There are hundreds or thousands of people stuck in traffic here right now. So unfortunately, everyone’s going to have to wait and be patient.”

There have been no reports of any injuries. Ontario Provincial Police is investigating along with Halton Regional Police Service.

All eastbound lanes are currently still open.

Pile up – #Hwy401 WB blocked west of #Hwy25 due to multi vehicle collision. 20 vehicles involved including transpor… https://t.co/MU6jAILFmu

— Sgt Kerry Schmidt (@OPP_HSD) February 13, 2019