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.
More than a thousand schools were closed in France on Tuesday and the top floor of the Eiffel Tower was shut to tourists as a severe heatwave continued to grip Europe, triggering health alerts across the region.
Thailand's Constitutional Court on Tuesday suspended Prime Minister Paetongtarn Shinawatra from duty pending a case seeking her dismissal, in a major setback for a government under fire on multiple fronts and fighting for its survival.
President Donald Trump has signed an executive order terminating a US sanctions programme on Syria, allowing an end to the country's isolation from the international financial system and building on Washington's pledge to help it rebuild after a devastating civil war.
Former criminology graduate student Bryan Kohberger has agreed to plead guilty to killing four Idaho college students in 2022, a move that would spare him the death penalty under a deal with prosecutors, according to the family of one of the victims.
US President Donald Trump plans to host Israeli Prime Minister Benjamin Netanyahu at the White House on July 7, a US official said, as the American leader pressed for a ceasefire between Israel and Hamas in Gaza, and the return of remaining hostages.
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