In November 1991, two Libyan intelligence agents, Abdelbaset al-Megrahi and Lamin Khalifah Fhimah, were charged with the December 1988 Lockerbie bombing. Libya refused to extradite the two accused to the U.S. or to Scotland. As a result, United Nations Security Council Resolution 748 was approved on 31 March 1992, requiring Libya to surrender the suspects, cooperate with the Pan Am Flight 103 and UTA Flight 772 investigations, pay compensation to the victims' families, and cease all support for terrorism. The UN imposed further sanctions with Resolution 883, a limited assets freeze and an embargo on selected oil equipment, in November 1993. In 1999, six other Libyans who had been accused of the September 1989 bombing of Union Air Transport Flight 772 were put on trial in their absence by a Paris court. They were found guilty and sentenced to life imprisonment.