The agreement was opposed by Hamas and other Palestinian factions, which launched suicide bomber attacks at Israel. Rabin had a barrier constructed around Gaza to prevent attacks. The growing separation between Israel and the "Palestinian Territories" led to a labour shortage in Israel, mainly in the construction industry. Israeli firms began importing labourers from the Philippines, Thailand, China and Romania; some of these labourers stayed on without visas. In addition, a growing number of Africans began illegally migrating to Israel. On 4 November 1995, a far-right-wing religious Zionist opponent of the Oslo Accords assassinated Prime Minister Yitzhak Rabin. In February 1996 Rabin's successor, Shimon Peres, called early elections. In April 1996, Israel launched an operation in southern Lebanon as a result of Hezbollah's Katyusha rocket attacks on Israeli population centres along the border.