Seoul warned the public on Saturday to avoid more balloons sent from North Korea and to report them to the military or police.
South Korea's military said North Korea was sending more balloons carrying "filth" across the heavily fortified border.
North Korea sent hundreds of balloons carrying trash and excrement earlier this week, calling them "gifts of sincerity" and vowing to send more. On Saturday, South Korean Defence Minister Shin Won-sik called this "unimaginably petty and low-grade behaviour".
A public message broadcasted by the city of Seoul asked the public to refrain from touching balloons "identified in the sky near Seoul" and report them as they were "being handled by the military".
Other regional governments had been asked to broadcast similar messages, the defence ministry said.
North Korea has said the balloons were retaliation for an ongoing propaganda campaign by North Korean defectors and activists in South Korea, who send balloons containing anti-Pyongyang leaflets, food, medicine, money and USB sticks loaded with K-pop music videos and dramas across the border.
Iran's state TV said it had obtained a draft of an initial, unofficial framework for a memorandum of understanding between Iran and the United States on ending their conflict.
Five people who had been trapped inside a cave in Laos for about a week were found alive on Wednesday, as dozens of Lao and Thai rescuers continued to search for two others, Thai volunteers said.
Israeli raids targeting several areas across Lebanon on Tuesday killed 31 people and wounded 40 others, Lebanon's health ministry said, in one of the heaviest days of bombing in weeks.
Israel said on Wednesday it had killed Hamas's newly appointed armed wing chief in Gaza, days after it killed his predecessor, while intensifying military pressure in Gaza and expanding operations in Lebanon.
Syria's transitional leadership has located remnants of former President Bashar al-Assad's clandestine chemical weapons programme, including raw materials and munitions similar to those used to carry out deadly gas attacks during the country's long-running civil war.
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