Washington, Feb 2 : At least 21 people have died in one of the worst cold snaps to hit the US Midwest in decades.
The temperature reached -17C (0F). Some 250 million Americans overall have experienced the "polar vortex" conditions, a report in BBC said.
Hospitals have been treating patients reporting frostbite as parts of the country ground to a halt.
Temperatures are expected to swing to above average over the weekend.(UNI)