There were few public air raid shelters. The largest, beneath the main railway station, housed 6,000 refugees. As a result, most people took shelter in cellars, but one of the air raid precautions the city had taken was to remove thick cellar walls between rows of buildings and replace them with thin partitions that could be knocked through in an emergency. The idea was that, as one building collapsed or filled with smoke, those sheltering in the basements could knock walls down and move into adjoining buildings. With the city on fire everywhere, those fleeing from one burning cellar simply ran into another, with the result that thousands of bodies were found piled up in houses at the ends of city blocks.