An emergency medical services and fire services spokesman said eleven people were feared dead after a plane taking them on a parachute jump crashed in southern Poland shortly after take off.
One man in his forties survived and was taken to hospital in the city of Czestochowa in serious condition, 207 kilometres (129 miles) south-west of Warsaw.
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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.