Footage has been released showing the extensive damage wreaked by a tornado in the US state of Kansas.
There are reports of "mass casualties" in the neighbouring state of Arkansas, while local media also say two people have died in the town of Quapaw in Oklahoma.
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Another cold, frosty and foggy night for many. Northern and western areas will see thickening cloud, patchy rain and milder temperatures.
Temperatures have already plunged to -12C in some parts of the UK this winter - but Thursday could be the coldest day yet.