Story highlights Up to 2,000 migrants are sheltering in derelict warehouses in Belgrade

They are living without sanitation and in a sub-zero winter

Belgrade (CNN) In a derelict warehouse behind Belgrade's main coach station, up to 2,000 migrants are trying to survive the freezing Serbian winter in a crumbling building with broken windows, no heating, or warm water.

It is -11 Celsius and a bitterly cold blizzard is lashing them while they try to warm up by burning wood outside the grim warehouse they now call home.

Some of the migrants, who mainly come from Afghanistan, are wrapped in blankets given out by agencies, but most shiver in jackets inadequate for the sub-zero temperatures they endure day and night.

Inside the warehouse, the air is thick with smoke from several makeshift fires and groups of men huddle together trying to thaw their hands by the orange flames.

The dark smoke renders the visibility to only a few feet, but the darkness is pierced by the sounds of people coughing, choked by the unhealthy air and the cold.

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