From 1983 to 1993, Arafat based himself in Tunisia, and began to shift his approach from open conflict with the Israelis to negotiation. In 1988, he acknowledged Israel's right to exist and sought a two-state solution to the Israeli–Palestinian conflict. In 1994 he returned to Palestine, settling in Gaza City and promoting self-governance for the Palestinian territories. He engaged in a series of negotiations with the Israeli government to end the conflict between it and the PLO. These included the Madrid Conference of 1991, the 1993 Oslo Accords and the 2000 Camp David Summit. In 1994, Arafat received the Nobel Peace Prize, together with Yitzhak Rabin and Shimon Peres, for the negotiations in Oslo. At the time, Fatah's support among the Palestinians declined with the growth of Hamas and other militant rivals. In late 2004, after effectively being confined within his Ramallah compound for over two years by the Israeli army, Arafat fell into a coma and died. While the cause of Arafat's death has remained the subject of speculation, investigations by Russian and French teams determined no foul play was involved.