ADVISORY SYSTEM DEFINITIONS A low condition is declared when there is a low risk of terrorist attacks. Routine security is implemented to preclude routine criminal threats.   A guarded condition is declared when there is a general risk of terrorist attacks. General risk with no credible threats to specific targets.   An elevated condition is declared when there is a significant risk of terrorist attacks. Elevated risk of terrorist attacks but neither a specific region of the United States nor target has been identified.   A high condition is declared when there is a high risk of terrorist attacks. Credible intelligence indicates there is a high risk of a local terrorist attack but a specific target has not been identified.   A severe condition reflects a severe risk of terrorist attacks. A terrorist attack has occurred or credible and corroborated intelligence indicates that one is imminent. Normally, this threat condition is declared for a specific location or critical facility.