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 warned of possible military actions if North Korea continues to fly more trash balloons across the border, a rare direct threat of retaliation since Pyongyang started sending them in May.

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