Tornadoes devastate U.S. Midwest

A massive storm system has torn through a wide swath of the Heartland, ripping roofs off buildings and rendering rural roads impassable with debris.

In Olmsted County, Minnesota, sheriff's officials described 'multiple levels' of damage following the severe weather outbreak.

Dramatic timelapse footage captured funnel clouds sweeping over schools and residential neighborhoods, forcing thousands to seek shelter.

Meteorologists warn that more storms are on the way, keeping millions under threat as the destructive system moves eastward.