Men and boys occupying the sprawling complex — a vast crumbling building with few windows or doors — found themselves in danger of exposure while aid groups scrambled to help. A search for firewood became a morning routine — migrants chopped branches from frozen trees or burned old wooden railway tiles they picked from the abandoned tracks by the warehouse. At lunchtime every day, hundreds of migrants lined up, with a blizzard brushing wind and snow against their faces, to receive a warm meal distributed by aid groups.