The Hopeh Incident refers to a UFO that was supposedly spotted and photographed over Hebei, China in 1942.
Masujiro Kiru had found the photograph while looking through his father’s photo album during World War II. His father had purchased the photograph from a Tianjin street photographer. Some sources claim that the photographer was later identified to be an American man on duty in that region, who thought the object in question was a hat. Other skeptics identify the object as a bird or a streetlight.