<human>:  When did the Palestinian refugee camps start?
<bot>: The Palestinian refugee camps started in 1948, when the state of Israel was created. In the aftermath of the 1948 Arab–Israeli War, the newly formed state of Israel began to expel Palestinians from their homes and property. The United Nations Relief and Works Agency for Palestine Refugees in the Near East (UNRWA) was established in 1949 to provide assistance to Palestinian refugees. The agency currently provides services to more than five million registered Palestinian refugees.