The Hassleholm Sighting: A Transair DC-3 Crew and an Unknown Object over Skane, Sweden on 17 December 1953
A named airline captain, a named crew chief, a Defence Staff communique and an Air Force investigation, inside a US Air Attache report that graded the information probably true and then spent a paragraph attacking the witness.
What did witnesses see at Near Hassleholm?
At 14:37 on Thursday 17 December 1953 the chief pilot of the Swedish airline Transair reported passing an unknown object over Hassleholm in Skane. The sighting was released to the Swedish press, picked up by the office of the United States Air Attache in Stockholm, translated, and forwarded to Washington as an Air Intelligence Information Report. That report was declassified under authority NND 57597 and published by the Department of War on 23 October 2026 as DOW-UAP-D163, in the seventh tranche of the PURSUE release programme.
The document is an AF Form 112 numbered IR-12-54, carrying the handwritten control number AF606573. Its subject line reads "Flying Saucer" Sighted By Swedish Pilot. The country is Sweden, the originating agency is the Office of the Air Attache in Stockholm, the date of report is 13 January 1954, and the date of information is given as December 1953 to January 1954. It was prepared by Major Burt Rowen of the United States Air Force and approved by Lieutenant Colonel Herbert J. Rogers, Acting Air Attache. The source is listed as "Press and Personal Contact", and distribution was to A-2 USAFE and the US Army Attache in Stockholm.
The report carries an evaluation of B-2. On the standard intelligence evaluation scale used on these forms, the letter grades the reliability of the source and the number grades the credibility of the information, with B indicating a usually reliable source and 2 indicating information judged probably true.
More footage and images of this sighting
What is the official explanation?
The Swedish Defence Staff issued a communique, quoted in the report in translation:
"The air crew of a civil aircraft observed on Thursday at 1437 hours over the area of Hassleholm an unknown object moving in the opposite direction from the airplane. The object was observed for six to seven seconds. At that time and altitude the weather was clear. Because of the low lying cloud formations the object is not thought to have been seen from the ground. The Defense Staff does not know of any Swedish plane that was in that area at the time in question. An investigation is being conducted."
The head of the Swedish Air Force, General Nordenskiold, is quoted saying it had been established that the object could not have been any Swedish aircraft, and adding: "We are now investigating what our radar stations might have spotted." The report does not record what the radar investigation found, and this archive has not located a published Swedish result.
The American assessment is contained in the document itself. Having graded the information B-2, the Air Attache's office closed by noting that its own source personally doubted the story while the newspapers reported that the Defence Staff was continuing to investigate, and stated that the office was attempting to obtain further information.
What did the witnesses think it was?
Captain Ulf Christiernsson, chief pilot of Transair, was flying a DC-3 from Bulltofta to Bromma with his crew chief Olle Johansson. The report reproduces a translation of his newspaper interview:
"A shining metal spherical elliptical object came toward them traveling in the opposite direction from their machine at an estimated speed of sound and approximately 600 meters below their DC-3. It was visible six to seven seconds."
Christiernsson described the aircraft as being on automatic controls when the encounter occurred, and said he had time for nothing other than to report to Bulltofta and to the Defence Staff. In his own words:
"Previously I have been extremely skeptical about all the stories of mysterious objects, called flying saucers, that have been seen at diverse points. Now I don't know exactly what to think; but it did seem to me that we had seen a robot of some kind. When I first caught sight of the object, which like us was in the civil air corridor, I thought it was a jet. We had, however, received no word that any such thing was on the way."
On the geometry and the appearance:
"We were flying at an altitude of approximately 2,150 meters and the object was around 600 meters below us. It was going in a southwesterly direction and disappeared after six or seven seconds. The object had a strong metal shine; the crew chief, Johansson, who could see it longer than I, thought it was almost phosphorescent. The flying weather was excellent above the clouds, which were at an altitude of about 1500 meters, and the sun was shining brightly. The object was proceeding just above the clouds. The first silhouette I got diagonally from the right was narrow. When it was nearly directly under us, however, I saw that it was nearly round, just slightly elliptical."
He added that the object gave off no waste gases and no condensation trail, and that it could definitely not have been a meteor. Asked whether he had been afraid, he answered: "No, but curious, very curious."
The report then supplies a character sketch, and it is unusually hostile for a document that has just graded the information probably true. Christiernsson is described as 41 years old, born in Skane, and as having flown roughly thirty operational sorties in Mosquitoes over North Africa and Italy as a wartime volunteer with the Royal Air Force, finishing as a captain. An unnamed source in the Royal Swedish Air Board, described as a lifelong acquaintance born in the same town, is then quoted saying that Christiernsson "is charming and well-liked, but that he is also most untrustworthy and was dismissed from a former position for financial difficulty". The same paragraph records that during the war Christiernsson tried to take a Swedish Air Force B-18 and fly it to England, was intercepted at Gothenburg, and was jailed. It closes by noting that it is generally agreed in the Swedish Air Force that he is one of the best and most discussed pilots in Sweden, and that he never served with the Royal Swedish Air Force except as a reserve captain.
Is the Hassleholm Sighting: A Transair DC-3 Crew and an Unknown Object over Skane, Sweden on 17 December 1953 real? The two-pass assessment
Pass one, how could this be mundane.
The duration is the central weakness. Six to seven seconds of a bright object passing in the opposite direction, seen from an airliner at about 2,150 metres, is a short look, and Christiernsson himself says his first impression was a jet. A jet in the civil corridor remains the obvious candidate, and the only thing in the file that argues against it is the pilot's own silhouette judgement and the Defence Staff's statement that it knew of no Swedish aircraft in that area, which is not the same as saying no aircraft of any nationality was there.
A meteor is excluded by the witness and by the geometry he describes: he reports a level object travelling just above a cloud layer at about 1,550 metres, not a descending trail, and he notes the absence of any trail or exhaust. A balloon is not a natural fit for an object closing at an estimated speed approaching that of sound, though a pilot's estimate of the closing speed of an unfamiliar object seen for six seconds is among the least reliable figures in any sighting report, and it should be treated as an impression rather than a measurement.
The character sketch is the other half of pass one and it has to be weighed honestly, in both directions. A documented dismissal for financial difficulty and a wartime attempt to steal a military aircraft are real matters of record as the Air Attache reports them, and a source who knew the man personally doubted his story. That is a substantive challenge to the witness.
It is not, however, a demonstration that the sighting did not happen, and three things limit it. The derogatory material comes from a single unnamed source. It is character evidence rather than evidence about the event. And it does not touch Olle Johansson, the crew chief, who saw the object for longer than the captain did and described it as almost phosphorescent, and whose account the report does not question at all. This archive does not wholesale-discredit witnesses on hostile testimony, and a second man in the same cockpit reporting the same thing is not answered by an attack on the first.
Pass two, if real, what is it.
What survives is narrow but real. Two crew members on a scheduled flight reported a metallic, self-luminous, near-spherical object passing beneath them in the opposite direction, in clear air above a cloud deck in daylight. The Swedish Defence Staff thought it serious enough to issue a communique and open an investigation, and the Air Force chief publicly stated it was not a Swedish aircraft and that radar records were being examined. The United States Air Attache, with the character sketch in front of him, still graded the information probably true and told Washington he was seeking more.
The tier is Unknown. No official narrative was ever published that explains the object, the radar investigation result is not in the file and has not been located, and the dispute in the record is about the witness rather than about the imagery, of which there is none. The case rests entirely on testimony, and the file preserves both the testimony and the attack on it.
Sources
- www.war.gov/medialink/ufo/release-07/documents/DOW-UAP-D163-Air_Intelligence_Information_Report_Sweden-1953.pdf
- www.war.gov/UFO/
- www.war.gov/Portals/1/Interactive/2026/UFO/uap-data.csv
More cases from this region: UFO sightings in Sweden
