Ghost Rockets is the name given to mysterious rocket or missile
shaped objects which were sighted on many different occasions between
May and December 1946, with peaks on the 9 and 11 August 1946. They were
seen primarily in Sweden and nearby Scandinavian countries, but also in
other European countries as well. Altogether some 2000 reported
sightings were logged, 200 of them being on radar, and a number of
fragments were reported found by military authorities.