Death toll from US weekend tornadoes rises to at least 40

At least 40 people were killed and dozens more injured by tornadoes and violent storms that ravaged the central and southern United States at the weekend, local authorities said.

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Local news channels across the affected region showed video of roofs torn off homes, trees felled, and trucks overturned by high winds.

Eight people died in Kansas in a crash involving more than 50 vehicles, caused by low visibility during a "severe dust storm", local police said.

In Oklahoma, four people were killed as wildfires and strong winds swept across the state, the local emergency management department said.