during humanitarian or peace-enforcing/-keeping missions; Within DSI The Dienst Speciale Interventies is the joint operations centre for domestic CT operations, and it combines special units from the Ministries of Defence and Justice. These units are: Unit Arrest Teams: regional SWAT teams of the National Police Corps. Unit Intervention: rapidly deployable counter-terrorist unit consisting of both military and law enforcement personnel. Unit Expertise and Operational Support: support unit providing sniper fire support, crisis negotiation and technical support. Operations The UIM has seen a lot of action since its creation. The first real intervention mission was the recapture of the Scheveningen prison in October 1974. Operators used hand-to-hand combat and stun grenades against jailed terrorists, who had revolted and held the prison under siege. The best-known intervention mission was ending the combined siege of a train and a primary school, which was done by South Moluccan terrorists. The UIM managed to kill the six captors on the train during a short but precise raid. Two hostages did not survive this. The raid was successful due to the fact that the Royal Netherlands Air Force was called in, with six F-104 Starfighter aircraft making very low flypast manoeuvres in full afterburn. This was mainly a distraction, allowing for a swift raid and the killing of the six captors on board. The siege at the primary school ended not long after the train siege had ended. On 13 March 1978, the UIM responded to a province hall hostage crisis in Assen. The raid came just in time: the hijackers had almost executed two people. The UIM was meant to be deployed to enforce arms embargoes in the Balkans, but they were never deployed in the 1990s. A known operation of the UIM was on 10 November 2004 in The Hague. The police had tried to arrest Ismail A. and Jason W. (members of the Hofstad Network) in a house at the Laakkwartier, but failed, as three police officers had been injured by grenades thrown at them by the terrorists. UIM operators were ordered to secure and maintain the site. After a successful raid, the two young terrorists were arrested. The unit has been deployed to Afghanistan under Task Force 55 with KCT operators. In 2008, the UIM had been active in the seas near Somalia as a security detachment for the Royal Netherlands Navy frigate Hr. Ms. De Ruyter, that was tasked with the