A major ice storm has created treacherous driving conditions across Iowa and eastern Nebraska and prompted temporary closures of Interstate 80 after numerous cars and trucks slid off the road.

An ice storm has caused chaos on roads in the Midwest in the US, while on the West Coast, officials are checking whether San Francisco suffered its first tornado in almost two decades.Winter weather disrupted both the US Midwest and California on its West Coast at the weekend.

A major ice storm created treacherous driving conditions across Iowa and eastern Nebraska this weekend and prompted temporary closures of Interstate 80 after numerous cars and trucks slid off the road.