The present Eritrean Jewish community is believed to be started by Yemenite Jews from Yemen attracted by new commercial opportunities driven by Italian colonial expansion in the late 19th century. The Jewish population then later increased from European refugees coming to Eritrea to escape the anti-Semitic regimes in Europe at the time. Many emigrated to Israel in 1948. During British administration, Eritrea was often used as a location of exile for Irgun and Lehi guerrillas. Among those imprisoned was future Israeli prime minister Yitzhak Shamir and Haim Corfu, a founder of Beitar Jerusalem. In 1961 the Eritrean War of Independence began after Eritrea was annexed by Ethiopia. It was then that Jews began to leave Eritrea. In the early 1970s, Jewish emigration increased because of ensuing violence between Eritrea and Ethiopia (up to and beyond Eritrea's official declaration of independence in 1993). Judaism is not one of the four religions recognized by the Eritrean government and indeed, as of 2006 there was only one last native Jew left in Eritrea – Sami Cohen, who tends to the Asmara Synagogue and cemetery.