UPDATE: Hamilton-area highway closed after collision; 2 have life-threatening injuries

Highway 6 near Waterdown is shut down after a major collision that has sent six people to the hospital, including two with life-threatening injuries.
Ontario Provincial Police say that as many as five vehicles might have been involved in collisions, including head-on collisions. Impairment might have been a factor.
The other four people involved in the crash also have serious injuries.
The highway has been closed in both directions between Concession Road 5 East and Concession Road 6, say the Ontario Provincial Police. A collision reconstruction team is at the scene, which typically means that delays will last for several hours until they have completed their investigation.
The OPP is asking witnesses to call the Burlington OPP detachment (905-681-2511). Tips can also be reported to Crime Stoppers (1-800-222-8477, or 1-800-222-TIPS).
COLLISION: #Hwy6 between Concession 5 E and Concession 6 E #Waterdown: All lanes blocked. @HamiltonPolice , @HPS_Paramedics, @HamiltonFireDep and #OPP on scene. ^aw
— OPP GTA Traffic (@OPP_GTATraffic) June 18, 2021
.@OPP_GTATraffic have closed highway 6 north of concession 5 for ongoing serious collision. Multiple trapped in several vehicles, one person ejected pic.twitter.com/XpXeCTn9ii
— Andrew Collins (@ACollinsPhoto) June 18, 2021
.@HamiltonFireDep @HPS_Paramedics crews extricating 2 patients. 6 patients in total, two with reported life threatening injuries. Collision reconstruction unit notified #HamOnt https://t.co/RLR5CRktXX pic.twitter.com/DIPtxE7m5G
— Andrew Collins (@ACollinsPhoto) June 18, 2021
Serious collision: #Hwy6 between the 5th and 6th Concession. 5 vehicles involved in multiple head on collisions. 6 people to hospital 2 with life threatening injuries. Witnesses call #BurlingtonOPP. Hwy 6 closed for investigation. Expect delays this evening pic.twitter.com/CwFcNjOfvk
— OPP Highway Safety Division (@OPP_HSD) June 18, 2021
As of 10:30 p.m., Hwy. 6 remained closed.
insauga's Editorial Standards and Policies advertisingUpdate: #Closure #Hamilton #HWY6 between Concession 5 East Flamborough and Concession 6 East Millgrove – All lanes are closed in both directions due to a collision. #ONHwys https://t.co/Pz7KsIIWBY
— 511Ontario (@511Ontario) June 19, 2021