The security threat during Northern Ireland's "Troubles" came from a number of paramilitary organisations, several of which are still active.
Terrorism related to the Troubles has greatly diminished in recent years, with the Provisional IRA and the main Loyalist groups ceasing their terrorist campaigns and engaging in the peace process. On 8 May 2007, the devolved Northern Ireland Executive was successfully restored with the creation of a new government under a power-sharing agreement between nationalist and Unionist political parties.
Historically, the most prominent sources of security threats in Northern Ireland have been: