When only two B-29 Superfortresses were sighted at 10:53, the Japanese apparently assumed that the planes were only on reconnaissance and no further alarm was given.
Ketika hanya dua B-29 Superfortress terlihat pukul 10:53, Jepang berasumsi bahwa kedua pesawat tersebut sedang dalam misi pengintaian dan tidak menyalakan sirene lagi.