The National Bureau of Investigation and the REBISZ arrested two of the men at the dawn of August 21, 2009, at the Pérenyi Club in Debrecen. The arresting force consisted of 85 officers and hundreds of detectives conducting house searches in 13 locations parallel to the arrests, during which they detained the other two suspects. While examining the detainees' homes and dozens of other locations, 1,916 items were seized: map sketches, the getaway vehicle and the winter tires, boots, cameras, and the weapons, which were found hidden in the Pérenyi Club. Police determined that the attacks had been timed, as the perpetrators had wanted to avoid any civilian injuries. In addition, the stolen weaponry from Besenyszög was also found and confiscated from the Kiss brothers' apartment. As the perpetrators lacked any official permit to handle the weaponry, they were also charged with misuse of firearms and ammunition.
