In late July, four security guards near the plant's main gate spotted three drone-like lights in the night sky. However, no drone was physically found, and the exact nature of the lights remains unknown. Concerned lawmakers held hearings with officials from the Nuclear Regulation Authority, the Defense Ministry and the land ministry. Yasukazu Hamada, a Lower House member of the ruling Liberal Democratic Party who is a former defense minister, was one of the concerned lawmakers. "If we cannot identify what it is, it's impossible to determine whether the Defense Ministry or the National Police Agency should handle it," he said.