A large tornado swept through suburbs southwest of Chicago late Sunday night, causing numerous injuries, damaging several homes and vehicles, bringing down trees and power lines and leaving tens of thousands of homes and businesses without electricity.

Naperville Fire Chief Mark Puknaitis said about a dozen homes were damaged by wind and falling trees, CBS Chicago reported. Six people were injured, and four of them were brought to hospitals with non-life-threatening injuries.

Tornado damage is seen in Naperville, Illinois late on June 20, 2021.

CBS Chicago

Tree limbs and debris were strewn about and windows were broken on many structures. There were no fires, but there were gas line breaks.

Crews were going door-to-door early Monday searching to make sure no one was trapped. A shelter was set up in an elementary school.

In the village of Woodbridge, where some of the heaviest damage was reported, police said assessments were underway but there were no significant injuries.

Police in Darien tweeted, “We are aware of the heavy damage in town and have contacted the utilities, have extra manpower on site and are managing the situation.”

They added that they “have reports of downed power lines around town, please stay away from them as shock hazards are a possibility.”

The line of storms moved over northern Illinois and into northwestern Indiana before forecasters declared the severe threat over at 1 a.m.