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On 14 September 1957, the Rio de Janeiro newspaper O Globopublished a letter which its columnist Ibrahim Sued claimed to have received a few days earlier. The letter referred to the sighting of a flying disk near Ubatuba, Sao Paulo a few days before the letter was written, which reportedly disintegrated into fragments. The author of the letter purported to enclose a small sample of the fragments. Commonly refered to as “the Ubatuba residue”, “the Ubatuba fragments” and “the Ubatuba incident”.
This incident is Case 28 in Isaac Koi's "Top 100" article, since it was referred to in 69 of the books covered by that article.
This was Project Blue Book Case Number 4955.