Vetevendosje MPs Albin Kurti, Albulena Haxhiu, and Donika Kadaj-Bujupi were arrested for failing to appear in court regarding accusations of releasing tear gas in the Kosovo Parliament.
The suspect, accused of committing war crimes in Suhareka in 1999, was issued a 30-day detention measure.
Citizens marched in support of former Kosovo PM and KLA commander Ramush Haradinaj, who was arrested in January on an international warrant issued by Serbia.
After a four-month investigation, the Kosovo Police Inspectorate has detained dozens of officers for felonies including abuse of office and bribery.
Hilmi Kelmendi, a Kosovo Albanian arrested on October 31 by the Serbian police under suspicion of war crimes, was released on Thursday.