Meanwhile, schools and offices are also closing in the U.S. Midwest as an arctic cold snap sweeps over the region.<br />At least seven people have been killed in several states as a result of the deep freeze.<br />Midwestern Wisconsin, Michigan and Illinois, among others, have declared states of emergency.<br />Officials are warning of almost instant frostbite as temperatures are dropping to minus 50 degrees Celsius in some places. <br />Ice-cold winds are also being accompanied by heavy snow causing travel chaos. <br />Thousands of flights have been canceled along with dozens of train services -- most of them in and out of Chicago. <br />
