North Korea used balloons to scatter “anti-South Korea leaflets” across Seoul on Thursday, authorities say, marking the first time the DPRK is known to have sent leaflet propaganda over the border in years.

The move appears to mark an escalation in Pyongyang’s monthslong trash balloon campaign, which has seen the launch of thousands of balloons carrying paper waste and even manure into South Korea since May but previously didn’t send political content.

In the latest launch, North Korea sent approximately 20 balloons over the border early Thursday morning, according to Seoul’s Joint Chiefs of Staff, reporting that the military discovered