'You aren't going to solve these problems by closing borders'

The UN refugee agency is warning of a `"build-up'' of migrants in Serbia as its neighbours tighten their borders.

It is not a crime to cross a border to seek asylum - info from @Refugees is here: http://t.co/MhwC4jtW1E pic.twitter.com/sOilzkGI0h

— United Nations (@UN) September 18, 2015

Adrian Edwards of UNHCR said the crisis “is growing and being pushed from one country to another” as about 4,000 migrants pour into Greece each day and head north.

He says stricter border controls by Hungary and Croatia threaten a bottleneck in Serbia, “which is not a country with a robust asylum system”.

Mr Edwards said: “You aren’t going to solve these problems by closing borders.”

UNHCR says more than 442,440 people have crossed the Mediterranean this year, and 2,921 have died trying.

Time is running out for Europe to resolve the refugee emergency. There are solutions. http://t.co/fPhoe4Nlx8 pic.twitter.com/slLeO1DSfi

— UNHCR Ireland (@UNHCRIreland) September 18, 2015