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.
One of Afghanistan's worst earthquakes killed more than 800 people and injured at least 2,800, authorities said on Monday, as helicopters ferried the wounded to hospital after they were plucked from the rubble of homes being combed for survivors.
Israel pushed tanks deeper into Gaza City and detonated explosives-laden vehicles in one suburb as airstrikes killed at least 19 people on Monday, Palestinian officials and witnesses said.
India's Narendra Modi told Vladimir Putin on Monday that India and Russia stood shoulder to shoulder even in difficult times after the Kremlin chief cast the Indian prime minister as his "dear friend" and gave him a lift in his armoured limousine.
Chinese President Xi Jinping urged leaders to leverage their "mega-scale market", while Russian President Vladimir Putin showed support for Xi's ambition for a new global security and economic order that poses a challenge to the US during a regional summit on Monday.
South Korea has suspended a military radio broadcast that transmits to North Korea as part of measures aimed at easing tensions with Pyongyang, Seoul's defence ministry said on Monday.
Broadcasting every weekday, Georgia Tolley goes beyond the headlines to speak to government ministers, decision makers, analysts and local experts to find out how the news will impact those of us living in the UAE.
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