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.
Pope Francis' wooden coffin was carried into St. Peter's Square on Saturday at the start of a funeral Mass attended by a multitude of mourners, including world leaders, pilgrims and prelates.
Royalty, presidents, prime ministers and a legion of faithful will pay their last respects to Pope Francis on Saturday at a funeral Mass in St. Peter's Square to honour his papacy.
India's army chief, General Upendra Dwivedi, will review the ongoing security situation in the state of Jammu and Kashmir following the deadly attack on tourists in Pahalgam.
Russia pounded Kyiv with missiles and drones, killing at least 12 people, in the biggest attack on the Ukrainian capital this year and drawing a rare rebuke from US President Donald Trump, who told Vladimir Putin to "stop".
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