A one-tenth scale model of Japanese Imperial Army's paper balloon bomb, displayed by Japan's Meiji University at the museum of Japanese Imperial Army's Noborito laboratory in Kawasaki, suburban Tokyo on May 29, 2015. (YOSHIKAZU TSUNO/AFP via Getty Images)
The first time that the U.S. was attacked by balloons from the Far East, six people were killed at a Sunday school picnic in the forests of Oregon.
Other bomb-laden balloons struck California, Texas, Colorado and other parts of western North America.
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