Reinforced Regional Task Force  Reinforced Regional Task Force (), prior to 2015 officially known as Piketen (or Piketenheten) is a regional special operations asset of the Swedish Police Authority, similar to SWAT type units in the United States. RRTF is called upon when situations occur that are too dangerous for ordinary police to handle such as hostage situations, serving high-risk arrest warrants and confronting armed criminals. RRTF units are based in Stockholm, Gothenburg and Malmö. The main responsibility of the RRTF is interventions in dangerous situations or dangerous environments, e.g. hostage situations and situations including armed dangerous suspects. Other duties are riot control, escorting VIP's/objects of value and serving high-risk arrest warrants etc.  RRTF, formerly known as Piketen, has been active since 1979. Its creation was an answer to the events of the Norrmalmstorg robbery in 1973, where robber Jan-Erik "Janne" Olsson took four hostages at Kreditbanken at Norrmalmstorg ("Norrmalm's Square") in Stockholm. RRTF operators from Malmö and Gothenburg have been deployed with the EULEX Intervention Group in Kosovo (Special Team Six), tasked with high-risk operations such as hostage rescue and arresting armed criminals. In 2011, the RRTF officially opened up for any female officers who wish to serve in the unit though none have passed selection yet. Due to the major reorganization efforts of 2015, Piketen was reclassified as "Förstärkt Regional Insatsstyrka", or in English, "Reinforced Regional Task Force", RRTF. The RRTF:s are stationed in the three largest cities of Sweden: Stockholm, Gothenburg and Malmö, providing a day round, year round tactical intervention capability in Police regions Stockholm, West and South. However the units can at request be put to use nationwide all over Sweden. The RRTF:s are part of the National Intervention Concept (NIK). Launched in 2015, this concept standardized and regulated the employment, structure and capabilities of the Swedish polices tactical units. The NIK divides the various tactical units into three levels of capabilities:   National capability: Provided by the NTF  Reinforced regional capability: Provided by the RRTF (Piketen) in regions Stockholm, West and South. General regional capability: Provided by regional tactical teams dispersed throughout their respective region. This capability exists in regions North, East, Mid and Bergslagen.