Trash-laden North Korean balloons were found on the grounds of South Korea’s presidential office compound, officials said, the latest in a series of incidents that have raised tensions and rhetoric on the Korean Peninsula, writes CNN.

More than 3,000 North Korean balloons, often filled with garbage such as cigarette butts, discarded batteries and even manure have fallen in the South since May, according to South Korean officials – who have responded by resuming loudspeaker broadcasts of propaganda and entertainment like K-pop songs along the demilitarized zone (DMZ).

The discovery at the presidential office Wednesday came after South Korean authorities warned the public to beware of falling objects as suspected North Korean trash balloons moved south toward the northern area of Gyeonggi province.

“While monitoring trash balloons sent by North Korea in cooperation with the Joint Chiefs of Staff today, we identified trash that fell in the presidential office area in Yongsan. No harmful or contaminating substances were found from an analysis by the response team”, - the presidential security service said later in a statement.

South Korea’s Joint Chiefs of Staff has advised people not to touch fallen balloons and to report any found to authorities.