General Police Radio Codes (International):

CodeMeaning
Code 1Urgent response is required (lights and sirens).
Code 2Non-urgent response (no lights or sirens).
Code 3No further assistance is required.
Code 4The situation is under control.
Code 5An officer needs immediate assistance (officer in distress).
Code 6Ambulance required.
Code 7Fire department required.
Code 8Hazardous material or dangerous situation present.
Code 9Request for permission to leave the scene.