The terrorist threat level was increased to the second-highest point on Tuesday, with a warning of a “real chance” of an attack, the National Coordinator for Security and Counterterrorism (NCTV) wrote in a report. The threat level was increased to its highest point in over four years. The threat assessment system used by the NCTV is a scale rising from the least severe first level, to the most severe fifth level. The NCTV raised the alert from level three, dubbed “significant,” to level four, called “substantial.