The investigation into the bombing of Pan Am Flight 103 began at 19:03 on December 21, 1988 when Pan Am Flight 103 was blown up over Lockerbie in Dumfries and Galloway, Scotland. The perpetrators had intended the plane to crash into the sea, destroying any traceable evidence, but the late departure time of the aircraft meant that its explosion over land left a veritable trail of evidence. The investigation led to the prosecution, conviction, and imprisonment of Abdelbaset al-Megrahi. Investigators In Scotland, responsibility for the investigation of sudden deaths rests with the local Procurator Fiscal (public prosecutor), who attends the scene and may direct the police in the conduct of their inquiries. The Procurator Fiscal holds a commission from the Lord Advocate, who is Scotland's chief law officer (and prior to devolution in 1999 was simultaneously a UK government minister). Responsibility for the Lockerbie investigation thus rested with Jimmy McDougall, the Procurator Fiscal in the nearby burgh of Dumfries, and with the Dumfries and Galloway Constabulary, by number of officers the smallest police force in the UK. According to a paper presented by the then Lord Advocate Colin Boyd, to a conference of law officers in 2001, the ordinary resources available to them were inadequate to deal with such an investigation. The police effort was therefore augmented by officers from all over Scotland and the north of England, and the Procurator Fiscal was given support from the Crown Office and Procurator Fiscal Service in Edinburgh. Funding the investigation quickly became a political issue and Margaret Thatcher announced that central government, not the Scottish Office, would meet any additional costs involved. On December 27, 2018, 'Wired', an online news website, published a long article; it highlights that the head of the U.S. Justice Department’s criminal division, Robert Mueller, oversaw the case. Additional details are given. Search for clues On December 28, 1988, just a week after the crash, the Air Accidents Investigation Branch announced that they had found traces of high explosives and that there was evidence that Pan Am 103 had been brought down by an improvised explosive device (IED). Over a thousand police officers and soldiers carried out fingertip searches of the crash site that lasted for months, retrieving 4 million pieces from the fields and forests of southern Scotland. The searchers were divided into groups of eight or ten, with the instruction: "If it isn't growing and it