A migrant receives a hot meal from volunteers, outside of derelict warehouses which they use as a makeshift shelter, in Belgrade on January 11, 2017, as temperatures dropped to -15 degrees Celsius overnight. According to the latest figures, around 7000 migrants are stranded in Serbia. / AFP PHOTO / ANDREJ ISAKOVIC (Photo credit should read ANDREJ ISAKOVIC/AFP via Getty Images)
Migrants stand in line for food distributed by volunteers outside of derelict warehouses which they use as a makeshift shelter in Belgrade on January 11, 2017, as temperatures dropped to -15 degrees Celsius overnight. According to the latest figures, around 7000 migrants are stranded in Serbia. / AFP / ANDREJ ISAKOVIC (Photo credit should read ANDREJ ISAKOVIC/AFP via Getty Images)
Migrants stand in line for food distributed by volunteers outside of derelict warehouses which they use as a makeshift shelter in Belgrade on January 11, 2017, as temperatures dropped to -15 degrees Celsius overnight. According to the latest figures, around 7000 migrants are stranded in Serbia. / AFP PHOTO / ANDREJ ISAKOVIC (Photo credit should read ANDREJ ISAKOVIC/AFP via Getty Images)
TOPSHOT - A migrant rests in a makeshift shelter at an abandoned warehouse in Belgrade on January 10, 2017, as temperatures dropped to -15 degrees Celsius overnight. According to the latest figures, around 7000 migrants are stranded in Serbia. / AFP PHOTO / ANDREJ ISAKOVIC (Photo credit should read ANDREJ ISAKOVIC/AFP via Getty Images)
A migrants stands in line for food distributed from volunteers, outside of derelict warehouses used as a makeshift shelter, in Belgrade on January 11, 2017, as temperatures drop to -15 degrees Celsius in the evening. According to the latest figures, around 7000 migrants are stranded in Serbia. / AFP PHOTO / ANDREJ ISAKOVIC (Photo credit should read ANDREJ ISAKOVIC/AFP via Getty Images)
