India, Aug. 8 -- Declassified US government records have revealed that American officials investigated a bizarre 1963 report claiming a metal sphere had crashed in a Brazilian town with a dead, unidentified occupant inside.

The alleged incident took place in Conde, a municipality in Brazil's Bahia state, on November 8, 1963. A Portuguese-language broadcast by Rio de Janeiro's Radio Tupi reported that a large metal sphere had fallen in the middle of the town, leaving a deep hole.

According to a US government transcript of the broadcast, the object allegedly contained a human body wearing heavy clothing marked with inscriptions that could not be deciphered.

The extraordinary report quickly drew the attention of US officials. American dip...