SEOUL: Trash from at least one North Korean balloon fell on the South Korean presidential compound Wednesday, raising worries about the security of key South Korean facilities from North Korean provocations.

The rubbish that fell on the ground at the compound in central Seoul contained no dangerous material and no one was hurt, South Korea’s presidential security service said in a statement.

But experts say South Korea needs to shoot incoming North Korean balloons at border areas next time, as it’s not clear whether North Korea would put in hazardous items in future campaigns.

North Korea’s latest balloon launches came days after South Korea boosted its frontline broadcasts of K-pop songs and propaganda messages across the rivals’ heavily armed border.

Their tit-for-tat Cold War-style campaigns are inflaming tensions, with the rivals threatening stronger steps and warning of grave consequences.

Seoul officials earlier said North Korea had used the direction of winds to fly balloons toward South Korea, but some of the past balloons had timers that were likely meant to pop the bags of trash mid-air.

The security service gave no further details about the rubbish found at the presidential compound, like whether balloons were discovered along with the trash.

If North Korea is found to have used timers or any other device to deliberately dump trash on key South Korean facilities like the presidential office, it would certainly invite strong response by South Korea.

But experts say dropping balloons at ground targets is extremely sophisticated technology and that North Korea would certainly lack such an ability.

The security service refused to disclose whether President Yoon Suk Yeol was at the office at a time. Yoon’s office earlier said he has no official schedule on Wednesday.

South Korea’s Joint Chiefs of Staff said earlier Wednesday that North Korean balloons were flying north of Seoul after crossing the border and had urged people to be alert for falling objects.

It was North Korea’s 10th such launch since late May. The more than 2,000 huge balloons so far have dropped wastepaper, scraps of cloth, cigarette butts and even manure on South Korea. North Korea has said it was responding to South Korean activists scattering political leaflets across the border via their own balloons.

Experts say North Korea considers South Korean civilian leafleting activities a major threat to its efforts to stop the inflow of foreign news and maintain its authoritarian rule.

In furious responses to past South Korean leafletting, North Korea destroyed an empty South Korean-built liaison office in its territory in 2020 and fired at incoming balloons in 2014.

The North’s balloons haven’t caused major damage but have raised security jitters among people worried North Korea could use such balloons to drop more hazardous materials like chemical and biological agents.

South Korea said Sunday it was ramping up its anti-Pyongyang propaganda broadcasts from its loudspeakers at all major sites along the land border because North Korea was continuing launches of trash-carrying balloons.

South Korea last Thursday restarted its loudspeaker broadcasts for the first time in about 40 days in retaliation for North Korea’s previous balloon activities.

Observers say South Korean propaganda broadcasts can demoralise frontline North Korean troops and residents.

In 2015, North Korea fired artillery rounds across the border in anger over South Korea’s restart of propaganda broadcasts, prompting the South to return fire.

South Korean Joint Chiefs of Staff spokesperson Lee Sung Joon said the ongoing South Korean broadcasts include K-pop songs and news on South Korean economic development.

South Korean media reported the broadcasts also contained news on the recent defection of a senior North Korean diplomat and called the mine-planting work by North Korean soldiers at the border “hellish, slave-like lives.”

South Korea has an estimated 40 loudspeakers — 24 stationary and 16 mobile ones. South Korea’s military said Monday it was fully operating the fixed loudspeakers and plans to use the mobile loudspeakers as well.

South Korea’s military has warned of other unspecified stronger steps if North Korea continues its balloon campaigns.

North Korea hasn’t made an official response to the South Korean propaganda broadcasts. But last week, Kim Yo Jong, the powerful sister of North Korean leader Kim Jong Un, threatened new countermeasures against South Korean civilian leafleting as she warned that South Korean “scum” must be ready to pay “a gruesome and dear price” over their actions.