World US, Japan left behind thousands of bombs after WWII. They’re still exploding and killing people in the Pacific. December 12, 2022December 12, 2022 USA TODAY Handout Comments Off on US, Japan left behind thousands of bombs after WWII. They’re still exploding and killing people in the Pacific. Each year, more than 20 people are killed or seriously hurt after one of the thousands of World War II bombs left by the U.S. and Japan explodes.