In pictures: South-east Europe freezes

South-eastern Europe is in the grip of some of the worst winter weather in decades, with heavy snow and fierce winds causing havoc across the region.

At least six people have died during the cold spell, and a state of emergency has been declared in areas of Greece and Bulgaria.

The worst snow storms in decades left cars buried in Greece ...

... as well as in Romania

In Istanbul, the Blue Mosque turned white ...

... while in Athens, visitors were barred from the Acropolis in case they slipped

Everybody has sought shelter as the snow continues to fall