New arrivals consisting of Jordanians from the north and south of the country and immigrants from Palestine had increased the city's population from 30,000 in 1930 to 60,000 in 1947. About 10,000 Palestinians, mostly from Safed, Haifa and Acre, migrated to the city for economic opportunities before the 1948 war. Many of the immigrants from al-Salt from that time were originally from Nablus. The 1948 war caused an exodus of urban Muslim and Christian Palestinian refugees, mostly from Jaffa, Ramla and Lydda, to Amman, whose population swelled to 110,000. With Jordan's capture of the West Bank during the war, many Palestinians from that area steadily migrated to Amman between 1950 and 1966, before another mass wave of Palestinian refugees from the West Bank moved to the city during the 1967 War. By 1970, the population had swelled to an estimated 550,000. A further 200,000 Palestinians arrived after their expulsion from Kuwait during the 1991 Gulf War. Several large Palestinian refugee camps exist around the center of Amman.