South Korea's Presidential Guard said the balloons did not contain any dangerous materials.
North Korea has sent more garbage-laden balloons across the tense inter-Korean border and, for the first time, dumped at least one of them at South Korea's presidential palace, South Korean officials said.
The Presidential Guard said in a statement that the balloon, which landed near President Yoon Seok-youl's office in Yongsan, central Seoul, on Wednesday, did not contain any dangerous objects and no one was injured.
South Korea's Joint Chiefs of Staff earlier said North Korea had launched more balloons into its territory, and Seoul city authorities urged residents to report the objects and avoid touching them.
The balloon launch, North Korea's 10th this year, came just days after South Korea said it would step up propaganda broadcasts along the two countries' heavily militarised border.
North Korea has released more than 2,000 balloons across the border since May, prompting South Korean authorities to resume broadcasts for the first time in six years.
Some of the balloons have timers that release their contents into the air, and they are stuffed with a variety of rubbish, from cigarette butts to scraps of paper, used batteries and compost.
No injuries or serious damage have been reported from the balloons, but they have raised safety questions in South Korea because they could carry dangerous materials, including chemical or biological weapons.
North Korea said the balloon launch was in retaliation for South Korean activists throwing leaflets and USB sticks into North Korean territory as part of efforts to undermine the regime of North Korean leader Kim Jong Un.
Kim Jong Un's influential sister, Kim Yo Jong, last week threatened to impose a “terribly high price” on the “bad guys” behind the leaflet distribution.
North Korea has been infuriated by propaganda campaigns aimed at its leadership in the past, blowing up a liaison office set up by South Korea on its territory in 2020 and firing anti-aircraft guns at balloons launched by activists in 2014.
