Negotiations concerning the agreement, an outgrowth of the Madrid Conference of 1991, were conducted secretly in Oslo, Norway, hosted by the Fafo institute, and completed on 20 August 1993; the Oslo Accords were subsequently officially signed at a public ceremony in Washington, D.C., on 13 September 1993, in the presence of PLO chairman Yasser Arafat, Israeli Prime Minister Yitzhak Rabin and U.S. President Bill Clinton. The documents themselves were signed by Mahmoud Abbas for the PLO, foreign Minister Shimon Peres for Israel, U.S. Secretary of State Warren Christopher for the United States and foreign minister Andrei Kozyrev for Russia.