In 1991, after a three-year investigation, US and UK authorities announced indictments against two Libyan intelligence officials in connection with the 1988 bombing of Pan Am Flight 103 over Lockerbie, Scotland, which killed 270 people. During a trial held a decade later in the Netherlands, one of the defendants was found guilty and sentenced to life imprisonment. Whose presence on board the airplane has given rise to a number of conspiracy theories about the motivations behind the bombing? Discuss