United Nations: UN Secretary-General Ban Ki-moon expressed concern on Friday over the increasing number of border restrictions targeting migrants in the Balkans and said they ran contrary to the international refugee convention.

The border rules in Austria, Slovenia, Croatia, Serbia and Macedonia ‘are not in line’ with the 1951 convention ‘because individual determination of refugee status and assessment of individual protection needs are not made possible,’ said UN spokesman Stephane Dujarric.

Slovenia, Croatia and Serbia said Friday they would each restrict the number of migrants allowed to enter their territories to 580 per day.

That announcement followed Austria’s decision last week to introduce a daily cap of 80 asylum-seekers and a maximum of 3,200 migrants would be allowed to pass through each day.

The number of asylum-seekers entering Greece from Turkey continues unabated and the border closures along the Balkan route ‘are creating a difficult situation in Greece,’ he added.

Ban is ‘fully aware of the pressures felt by many European countries’ during the migration crisis, said Dujarric.

‘However, he calls on all countries to keep their borders open, and to act in a spirit of responsibility sharing and solidarity, including through expanding legal pathways to access asylum.’

Close to 120,000 migrants have already arrived in Europe so far this year, according to the UN refugee agency.