Debris was found more than a day after the North’s latest balloon launch. South Korea says it’s essentially impossible to track every balloon.

South Korea's Joint Chiefs of Staff said Seoul may respond militarily to any casualties caused by North Korea's launching of so-called "trash balloons."

North Korea sent more balloons likely carrying trash toward South Korea on Sunday, the South's military said, just four days after a similar launch. The Joint Chiefs of Staff said the North resumed its balloon campaign and warned the balloons may float toward Seoul and the surrounding Gyeonggi