Croatia opened its border with Serbia late Monday afternoon, allowing about 3,000 migrants who had been stranded in cold, rainy conditions for nearly two days to stream through.
Melita Sunjic, a spokeswoman with the U.N. refugee agency (UNHCR) who is on the border at Berkasovo, said that “without any announcement, the borders opened. When the borders opened, everybody rushed” across.
It was not immediately clear why Croatia suddenly permitted the mass entry.
Backlog causes problems
The backlog occurred after Hungary shut down its crossing into Croatia early Saturday, forcing migrants to travel a longer route, through Slovenia, to reach Western European destinations.
Children take shelter from the rain in Sredisce ob Dravi, a border crossing between Croatia and Slovenia, Oct. 19, 2015.
“The decision by Hungary to close its border has certainly added to the suffering and misery and the length of the journey for these desperate people,” said Babar Baloch, a spokesman for UNHCR. “There will be challenges if the process becomes slow or we have a backlog of people.”
Sunjic said Monday that about 10,000 migrants entered Serbia from Macedonia on Sunday, more than the daily average over the past month, creating a “domino effect” when Slovenia slowed the flow of migrants over the Balkans by restricting their entry numbers to up to 2,500 a day.
'Big river of people'
"It's like a big river of people, and if you stop the flow, you will have floods somewhere. That's what's happening now," she said.
About 6,000 people were stuck on Monday in mud and driving rain on the Serbia-Croatia border. Conditions caused alarm among volunteers, who said humanitarian assistance and food were scarce. And more migrants are arriving daily.
Their situation is “awful and hellish,” Sunjic said. “These people are out in the open, they cannot sleep on the ground because of knee-deep mud.”
Others are becoming worried as the European winter sets in for the migrants, many of whom are fleeing war zones such as in Syria, Libya and Afghanistan.
Nighttime temperatures have dropped to around 5 degrees Celsius (41 degrees Fahrenheit) in the migrants’ camp in Calais, and will keep falling in the coming months.
Natacha Bouchart, mayor of the northern French city of Calais, said troops may be needed to cope with the rising number of migrants –- between 4,000 and 6,000, up from 2,500 in June -- camped in her city who are trying to reach Britain.
Bouchart told RMC radio Monday that lawlessness in the camps was untenable and said she was speaking with France's top security official about the situation.
Connected to England by a train tunnel, known as the Eurotunnel, Calais has been seen as a jumping off point for migrants for years. Illegal crossings to England numbered about 150 a day in August, but have slowed considerably amid tighter security measures.
More than a dozen migrants have been killed rushing the tracks since summer.
Slovenian policemen keep order as migrants attempt to board the first bus after opening the border with Slovenia in Trnovec, Croatia, Oct. 19, 2015.
Meanwhile, Turkish Prime Minister Ahmet Davutoglu said Monday he won't allow his country to be treated as a “concentration camp” for refugees but is willing to work with EU countries to stem the illegal flow of migrants.
"Nobody should expect Turkey to become a country housing all migrants, like a concentration camp,” Davutoglu said.
EU migrant plan
He made the comments a day after German Chancellor Angela Merkel held talks with Turkey's leaders on a European Union plan that would offer financial aid and faster EU membership for Turkey in the hope of winning its help in stemming the influx
Europe, struggling with the arrival of more than 600,000 people in the biggest migration movement it has seen since World War Two.
Greece's coast guard said Monday it rescued 2,561 people in nearly 70 operations in the eastern Aegean over the weekend.
On Sunday, the bodies of two women, a baby and a teenager were recovered near the remote island of Kastelorizo after their vessel overturned, while 12 others were rescued by a passing sailing boat. The deaths came a day after a 7-year-old boy died after falling into the water from a boat carrying 80 people who reached the island of Agathonissi.
Material for this report came from AP, Reuters and AFP.