Investigators today began sifting through the wreckage of an exhibition hall in southern Poland to establish why its roof collapsed under a layer of snow.

Polish authorities said today that they were unlikely to find more survivors under the twisted wreckage of an exhibition hall that collapsed during a racing pigeon show, killing at least 66 people and injuring 160.

Rescuers were today searching for victims buried when the roof of an exhibition hall in southern Poland collapsed on a racing pigeon show, killing at least 65 people and injuring a further 160.

The roof of a trade hall in the southern Polish city of Katowice has collapsed while some 500 people were inside, police said today.