Balkan routes leading to northern Europe close

Croatia seals 7 of 8 Serbian border crossings, claiming the influx is overwhelming country

Road and rail routes to northern Europe from the Balkans were closing to migrants on Friday, after a string of countries closed their borders to a relentless human wave.

The crisis, challenging the EU's humanitarian reputation and its vaunted policy of border mobility, has triggered an emergency summit of the 28-nation bloc that will take place on Wednesday.