In 1991, two Libyan intelligence agents were indicted by prosecutors in the United States and United Kingdom for their involvement in the December 1988 bombing of Pan Am Flight 103. Six other Libyans were put on trial in absentia for the 1989 bombing of UTA Flight 772 over Chad and Niger. The UN Security Council demanded that Libya surrender the suspects, cooperate with the Pan Am 103 and UTA 772 investigations, pay compensation to the victims' families, and cease all support for terrorism. Libya's refusal to comply led to the approval of Security Council Resolution 748 on 31 March 1992, imposing international sanctions on the state designed to bring about Libyan compliance. Continued Libyan defiance led to further sanctions by the UN against Libya in November 1993.