Moussa Koussa of Abdelbaset al-Megrahi, the alleged Pan Am Flight 103 bomber, whose involvement in the story is quite controversial. Several legal experts as well as the UN observer at the Lockerbie trial have vehemently challenged the verdict that convicted Megrahi. Koussa is also credited for the expulsion of Abu Nidal from Libya, whom he describes as a ruthless murderer and terrorist that Gaddafi allowed to live in Libya in 1986, the year the United States launched Operation El Dorado Canyon against Gaddafi for his association and harboring of terrorists. On 23 August 2002, the BBC reported that Abu Nidal was 'behind
Hans Köchler's Lockerbie trial observer mission of the doctrine of international law. In September 2008, following a meeting organised by the Lockerbie Justice Group at Greshornish House on the Isle of Skye, Köchler and Professor Robert Black called for a new public inquiry into the Lockerbie bombing. Köchler said:"Irrespective of the outcome of the current appeal, there should be a reinvestigation of the incident by the Scottish authorities. It is extremely frustrating that with regard to such an incident just one person has been presented as the culprit and no further questions asked. Only a child would believe such a story." During Köchler's visit to Scotland,