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.
Shipping through the Strait of Hormuz was at a standstill on Sunday after Iran reasserted control over the strategic waterway that is key to global energy supply, days before a fragile ceasefire with the United States was set to expire.
US President Donald Trump has no justification to deprive Iran of its nuclear rights, the Iranian Student News Agency quoted Iranian President Masoud Pezeshkian as saying on Sunday, as Washington and Tehran continue to face disagreements over nuclear issues.
Thousands of people have been displaced after a fire destroyed around 1,000 homes in a coastal village in Malaysia's Sabah state on Borneo island on Sunday, the fire department said.
Pope Leo sought to downplay his feud with US President Donald Trump on Saturday, saying reporting about comments he has made so far during his Africa tour "has not been accurate in all its aspects".
Two Indian-flagged vessels carrying crude oil were attacked on Saturday while attempting to cross the Strait of Hormuz, India's Ministry of External Affairs confirmed in a statement.
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