Incident #150 — Swedish Coast — 1 March 1948

This document comprises an Air Intelligence Information Report (TR 115-48) dated 30 December 1948, concerning sightings of unidentified objects over Sweden. The primary incident, designated Incident #150, occurred on 1 March 1948, when a Norwegian pilot and co-pilot flying from Aalborg, Denmark, to Oslo, Norway, observed a projectile moving along the Swedish coast. The object was described as being at an altitude of 20,000 feet, exhibiting a bluish-green flame, and following the Earth's surface for four seconds before disappearing over Norway. Notably, the object left no trail in the sky. The report includes an assessment by the Swedish Defense Staff, which stated that they had no proof of unidentified flying objects or vehicles traversing Swedish territory. All reports received by the Swedish Defense Staff during the preceding year were investigated and attributed to astronomical phenomena or other explainable causes. Furthermore, the report notes that Swedish radar capabilities, consisting of three ground stations and two radar-equipped destroyers, had not detected any unexplained objects. The document also contains a commentary regarding the Swedish Air Board's request for additional U.S. radar equipment, which had been previously negotiated with the Bendix Corporation but denied an export license by the U.S. State Department. The author suggests that providing this equipment might yield better intelligence information. Finally, the document includes an index of evaluations by Dr. Hynek, categorizing various incidents into astronomical, ordinary aircraft, or unexplained phenomena, with Incident #150 listed under the category of 'Lack of evidence precludes explanation.'