The South Korean military has warned of “stern military measures” if North Korea continues its ongoing trash balloon campaign. 

The Joint Chiefs of Staff(JCS) said in a statement Monday that it will take stern military measures if it decides North Korea has crossed the line or if it inflicts serious damage on the South Korean people. 

The statement did not elaborate on the nature of the military measures the JCS is planning. 

The JCS said that since May 28, the North has launched some 55-hundred trash-laden balloons on 22 occasions, intending to stir conflict within South Korea by causing inconvenience and anxiety among South Koreans, in acts the JCS called disgraceful and petty. 

The military plans to continue collecting the balloons after they land and has rejected calls to shoot them down in the air, saying that doing so could compromise public safety.

North Korea floated some 120 trash balloons between Sunday evening and Monday morning, causing flight delays at Incheon International Airport on Monday.