the morning of 5/21/2014, explosive sound and a mushroom cloud were
observed in Japanese western offshore.
location was the north of Kumejima island. The residents felt the
ground shaken with an explosive sound to find the mushroom cloud
is Tori Shima Range of United States Air Force in 28 km north of
Kumajima. The US armed forces states they held an air force training
from 10:00 to 11:00 of 5/21/2014, but none of the details were