Balloon bomb deaths at Bly
On 5 May 1945 a Japanese 'Fu-Go' paper balloon bomb exploded on Gearhart Mountain near Bly, Oregon, killing Elsie Mitchell and five children on a church picnic, the only deaths from enemy action on the US mainland in World War II.
1945 CE · 42.40, -121.00 · status: official
The account
Japan launched about 9,000 hydrogen balloons into the jet stream in 1944–45; a few hundred reached North America. The US censored reports so Japan would not learn of their success, so many sightings of drifting objects went unexplained at the time.
The sceptical view
Wartime secrecy around the balloons is a documented example of real aerial objects being officially hushed up, which ufologists later cited as precedent.
The researched reading
A secret wartime weapon killed six people. The case matters to UFO history only as proof that real aerial objects were officially hushed up.
| Explanation | Weight | Why |
|---|---|---|
| Secret human technology | 92% | The bomb was a Fu-Go, a secret Japanese balloon weapon carried by the jet stream. Its remains were recovered, and US censorship kept the balloon campaign quiet. It is a textbook case of a real secret aerial weapon. |
| Something known, misidentified | 3% | Because of the censorship, the public read other drifting objects at the time as mysterious, which is why ufologists cite the case. |
| A known natural phenomenon | 1% | The explosion was a bomb, not a natural event. |
| A poorly understood natural phenomenon | 1% | Not needed. |
| Perception, memory or mind | 1% | Not relevant to the deaths. |
| A hoax or fabrication | 1% | Fully documented. |
| Genuinely anomalous | 1% | Nothing unexplained. |
Official position: The US military identified the device as a Japanese balloon bomb; the deaths were the only ones from enemy action on the US mainland in the war.