Considering my buddy was on the flight and listening to what he said as well as some of the passengers it appears that the landing was VERY hard and the left main collapsed which caused the plane to veer off to the left of the runway into the snow. The fog was pretty heavy so who knows, sounds like whoever was conducting the approach might have flared way to late once the runway was aquired. Again, who knows, we all know fog can be thick as pea soup one second and then clear the next thanks to wind.