Emergency crews were on the scene of a large crash involving 25 vehicles and six semi trucks for several hours, shutting down a portion of Highway 16 near Maymont, Sask. and attending to 40 injured people. 

It began with a collision between vehicles travelling in the eastbound lane, which led to a crash in the westbound lane caused by drivers slowing down to get a look at the wreckage. 

Due to heavy fog in the area, police said other vehicles were unable to avoid the collisions and either slammed into the crashed cars or went into the ditch trying to avoid them. 

Emergency crews responded to the pileup at about 10:40 a.m. Saturday morning. 

"All I could see was when I turned off to come back into Maymont after being diverted — all I could see was STARS ambulance landing," said Debbie Penner, who drove through the area at the time of the crash. 

Hwy 16 crash

When ambulances arrived on scene, including an air ambulance from Saskatoon and one from Regina, there were about 40 people that needed attention. 

In total 13 people were rushed to hospitals in Saskatoon,  North Battleford and Regina, all varying in condition from serious to stable. 

"This was an extreme test for our service," Walter Dutchak, WPD Ambulance president. "Our paramedics did an amazing job handling this, thankfully we also had advanced care paramedics on scene to stabilize the more critical patients." 

No hazardous waste materials were spilled in the crash. 

Police said they do not believe alcohol to be a factor.

Several tow truck companies worked to clear the scene. Police reopened the highway at about 4:35 p.m. CST.