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.
US negotiators have arrived in Qatar for fresh diplomatic efforts aimed at advancing talks with Iran, although discussions are expected to take place through mediators rather than in direct meetings.
Afghanistan's Taliban has carried out airstrikes targeting ISIS centre in Pakistan's border province of Balochistan and Khyber Pakhtunkhwa on Wednesday, as tensions between the two countries further escalate.
Bangladesh could face a sharp increase in dengue infections over the next two months, health experts warned, as wet weather and inadequate mosquito control spur a wider outbreak.
Fourteen children died after the roof of a tutoring centre collapsed in Pakistan's eastern city of Lahore on Tuesday, rescue officials said, as authorities opened the way for a possible negligence investigation.
Handing President Donald Trump a stinging defeat, the US Supreme Court on Tuesday rejected his audacious attempt to restrict birthright citizenship in the United States — a right long woven into the fabric of American society — scuttling one of his top priorities in his crackdown on immigration.
Anti-immigrant protesters draped in flags and wielding wooden weapons marched across cities in South Africa on Tuesday to mark a deadline they had set for undocumented migrants to leave, with some marches hit by violence and looting.
Iran and the United States agreed to halt recent hostilities in the Gulf and renew talks regarding their dispute over the Strait of Hormuz, a US official said on Sunday, raising hopes of saving an interim peace deal that was under pressure from days of tit-for-tat strikes.
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