More than 100 tornados were reported overnight Sunday as a massive storm system ripped through the central United States, killing at least five people in Oklahoma.

Three children were among those killed and dozens of people were injured. Homes were reduced to rubble in parts of Oklahoma, Iowa and Kansas, and hundreds of thousands of residents were left without power.

The National Weather Service issued an advance warning for a high risk of severe weather Saturday, but the tornadoes still caught some communities by surprise.

Weather officials say more severe weather is possible Sunday from the southern state of Texas into Arkansas and north towards the Great Lakes, approaching the Canadian border.