North Korea is reportedly sending more trash-filled balloons toward South Korea after a similar move earlier in the week.

Kim Yo Jong, the sister North Korean leader Kim Jong Un, confirmed in a statement that the country was sending the balloons to “scatter mounds of wastepaper and filth.”

South Korea’s military dispatched chemical rapid response and explosive clearance teams to clean the debris that was found in various parts of the country.

Yo Jong said in the statement that the North would continue “scattering rubbish dozens of times more than those being scattered to us.”

Earlier this year, North Korea announced that it tested a nuclear-capable underwater attack drone, a weapon that could potentially destroy entire port cities.

“The Underwater Weapon System Institute under the DPRK Academy of Defense Science conducted an important test of its underwater nuclear weapon system ‘Haeil-5-23’ under development in the East Sea of Korea,” Pyongyang’s Korean Central News Agency (KCNA) reported at the time.

“Haeil” is allegedly the name North Korea assigned to a series of undersea drones it has been working on since 2012.

“Our army’s underwater nuke-based countering posture is being further rounded off and its various maritime and underwater responsive actions will continue to deter the hostile military maneuvers of the navies of the U.S. and its allies,” KCNA wrote, quoting an unnamed North Korean military official.