Migrant crisis: New routes sought amid impasse in Balkans
Migrants stranded in Croatia have been making renewed efforts to head north despite moves by Slovenia and Hungary to hold them back, BBC reported.
Slovenian police used pepper spray on Friday night to disperse a group trying to cross from Croatia.
Hungary, meanwhile, accused Croatia of breaking international law after asylum seekers were sent over the border without first being registered.
The EU, which is divided on the crisis, is to hold emergency talks next week.
Overnight, thousands of migrants trying to pass through the Balkans to reach northern EU states spent the night at railway stations or sleeping alongside roads.
Meanwhile, hundreds of people slept on a major motorway near Edirne in north-western Turkey, after Turkish police stopped them from crossing the border into Greece on Friday evening.