Poland-Belarus border crisis: what is going on and who is to blame?

Thousands of migrants are in the freezing region trying to get into Poland and aid is prevented from reaching them

More than 1,000 people, many fleeing dangerous conditions in Middle Eastern countries, arrived en masse at Poland's border with Belarus this week, in a dramatic escalation of a simmering migration crisis on the edge of the EU. They had been escorted to the border by Belarusian authorities.