Firefighters of Wisconsin estimate there were 150 vehicles involved in the accident.The Jackson County Sheriff's Office said in a Facebook post: "There is a massive crash involving many vehicles in both directions Northfield to Osseo and Osseo to Northfield."Emergency vehicles need to be able to get to the scene."Motorist Mike Olsen, who witnessed the incident, said there were about 20 semi-trucks that crashed into each other on the northbound lane, including several who had been travelling south.Olsen filmed at least five of the semi-trucks on fire at around 8am - after they were involved in separate crashes with passenger vehicles.In a Facebook post, he said: "Please stay home if you don’t need to be out driving."The Wisconsin State.
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