In June 1948, all railways and roads leading to West Berlin were blocked, and East Berliners were not allowed to emigrate. Nevertheless, more than 1,000 East Germans were escaping to West Berlin each day by 1960, caused by the strains on the East German economy from war reparations owed to the Soviet Union, massive destruction of industry, and lack of assistance from the Marshall Plan. In August 1961, the East German Government tried to stop the population exodus by enclosing West Berlin within the Berlin Wall. It was very dangerous for fleeing residents to cross because armed soldiers were trained to shoot illegal migrants.