one people died in the accident, including all the children, their chaperones, and the pilot and co-pilot of the Boeing cargo plane. One of the largest portions of the debris landed in a glade by Brachenreuthe, and the victims of the crash are commemorated there with a string of oversized "pearls". Less than two years later, on 26 February 2004, Peter Nielsen, the air traffic controller on duty at the time of the accident, was stabbed to death by an architect, Vitaly Kaloyev, who had lost his wife and two children in the accident. Nielsen was 36 years old. On 19 May 2004, the German Federal Bureau of Aircraft Accident Investigation (BFU) published its determination that the accident had been caused by shortcomings in the Swiss air traffic control system supervising the flights at the time of the accident and by ambiguities in the use of TCAS, the on-board aircraft collision avoidance system. Geography Überlingen is located on the so-called Überlinger Lake portion of Lake Constance, an important watersource for southwestern Germany. The countryside is a hilly moraine, formed in the last ice age. The city is from Zürich (Switzerland), approximate 1.25 hours; from Constance, or approximately 40 minutes, to Munich, approximately 2.5 hours. The following cities and communities border the city of Überlingen. Clockwise from the west, they are: Bodman-Ludwigshafen and Stockach, which belong to the County of Constance, and Sipplingen, Bodman, Ludwigshafen, Owingen, Frickingen, Salem and Uhldingen-Mühlhofen. The city exercises legal jurisdiction over the neighboring communities of Owingen and Sipplingen. Administrative subdivisions of Überlingen Besides central Überlingen (the Kernstadt), the town of Überlingen consists of several villages and neighborhoods. Throughout Baden-Württemberg, in the second half of the twentieth century, many old farmsteads were developed into neighborhoods. Some of them retained the names of old villages or large farmsteads. Administrative reorganizations consolidated many of these tiny communities into municipalities and administrative districts. After restructure in the administrative reform of the 1970s, the formerly independent municipalities of Bambergen, Bonndorf, Deisendorf, Hödingen, Lippertsreute, Nesselwangen und Nußdorf are now included in Überlingen. The unified townships are today, in the sense that they have their own elections for municipal governments, with a municipal administrator. Some are listed below: in the Kernstadt: Altbirnau, Andelshofen, Aufkirch, Brachenreuthe, Brünnensbach, Goldbach, Höllwangen, Hohenlinden, Kogenbach, Rengoldshausen, Restlehof, Reutehöfe, Weiherhöfe to Bambergen: Forsthaus Hohrain, Heffhäusle, Neuhof, Ottomühle, Reuthemühle, Schönbuch to Bonndorf: Buohof, Eggenweiler, Fuchsloch, Haldenhof, Helchenhof, Kaienhof, Negelhof, Talmühle,