https://en.wikipedia.org/wiki/Law_enforcement_in_the_Czech_R...

Municipal police cannot investigate crimes and doesn't take investigations, municipal policemen secure the suspects on the scene (also can transport suspects to the nearest state police station) and hand the case further to the state police for investigation. Officers of the municipal police in large cities are the basic public order keepers. Many municipal police agencies have common radio frequency with the state police to provide better and quicker response. This system is highly used in larger cities where it often happens that several municipal and state police units arrive to the scene at the same time.