A trash-carrying balloon sent by North Korea landed on the presidential office compound Wednesday, but nothing dangerous was found, the South Korean Presidential Security Service (PSS) said.The PSS said it discovered fallen trash on the grounds of the presidential compound while monitoring the latest batch of balloons flown by the North earlier in the day.North Korea has sent thousands of trash-filled balloons toward South Korea since May in protest of anti-Pyongyang propaganda leaflets sent by activists in South Korea across the border."An investigation by the chemical, biological and radiological response team showed the objects did not present a danger or contamination, so they were retrieved," the PSS said. "We are continuing to monitor in cooperation with the Joint Chiefs of Staff."Source: Qatar News Agency