The Jeonnam Police Agency’s Security Investigation Unit announced on the 21st that it had begun an internal investigation into the incident. A police official said, “In addition to calls to 112, we also received reports of spies to 113.” In addition, he said, “We have identified the identities of the people who put up the placards, and we are investigating suspicions of anti-aircraft warfare, etc.” It is known that National Intelligence Service agents also visited the pension in person and checked CCTV.