Six people were killed and more than 30 people were injured in crashes caused by “excessive winds” that blew dust from nearby farms onto Interstate 55 in a rural section of central Illinois, on Monday morning, leading to “zero visibility” conditions, the Illinois State Police said. The crashes, which took place just before 11 a.m. in Farmersville, Ill., south of Springfield, involved about 20 commercial vehicles and 40 to 60 cars, including two tractor-trailers that caught fire, the police said in a statement. The people injured were between 2 and 80 years old, and their injuries ranged from minor to life-threatening, the authorities said, noting that it had been difficult to extract people from their vehicles, some of which were engulfed in flames. “This is a difficult scene, something that is very hard to train for something that we really haven’t experienced locally,” Kevin Schott, the director of Montgomery County’s emergency management agency, said at a news conference on Monday.

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