About 6m across US at risk of extreme weather as over 700,000 without power

Outages concentrated in south-eastern US, with severe thunderstorms in Ohio valley and a suspected tornado in Indiana

More than 700,000 Americans were without power on Sunday evening, and about 6 million across the US were at risk for extreme weather, according to CNN.

The outages were concentrated in the south-eastern US, where there were severe thunderstorms in the Ohio valley as well as Arkansas, Tennessee and Mississippi. There was a suspected tornado in Bargersville, Indiana, just south of Indianapolis.