AP Photos: Young migrants survive on their own in Serbia

In an abandoned warehouse in the Serbian capital of Belgrade, Rasool, a 12-year-old from Jalalabad, Afghanistan, has spent the last six months sleeping on the ground, warming himself by fires, showering with cold water and eating meals distributed by aid groups.

"This place is so cold and dirty, the smoke from burning fires hurts my eyes and lungs," he said. "I close my eyes every night and open them in the morning wishing to hear from my elder friends that the border is open and leave to be with my cousins in London."

He's among dozens of minors, mostly from Afghanistan and Pakistan, living in the warehouse with hundreds of other, older migrants. Their...