In North America and other continents , for a threatened or completed terrorist attack , the Incident Command System ( ICS ) is apt to be invoked to control the various services that may need to be involved in the response . ICS has varied levels of escalation , such as might be needed for multiple incidents in a given area ( e.g. , the 2005 bombings in London or the 2004 Madrid train bombings , or all the way to a National Response Plan invocation if national-level resources are needed . National response , for example , might be needed for a nuclear , biological , radiological , or large chemical attack
2004 Madrid train bombings
2004 Madrid train bombings
Counter-terrorism