 Paulsson, in his research on the Jews of Warsaw, documented that Warsaw's Polish residents managed to support and conceal the same percentage of Jews as did residents in other European cities under Nazi occupation.Ten percent of Warsaw's Polish population was actively engaged in sheltering their Jewish neighbors.It is estimated that the number of Jews living in hiding on the Aryan side of the capital city in 1944 was at least 15,000 to 30,000 and relied on the network of 50,000–60,000 Poles who provided shelter, and about half as many assisting in other ways.