At least four dead as massive storm strikes multiple US states

A car is upturned in a parking lot after the severe storm swept through Little Rock (Andrew DeMillo/AP)

A monster storm system tore through the US south and midwest on Friday, spawning deadly tornadoes that shredded homes and shopping centres in Arkansas and collapsed a theatre roof during a heavy metal concert in Illinois.

At least one person was killed and more than two dozen were hurt, some critically, in the Little Rock area, authorities said.