The news was revealed on Monday by the Danish Oversight Board, known as TET, which is responsible for supervising the work of Denmark’s intelligence agencies. The TET said that “whistleblower complaints” had revealed information that pointed to improper intelligence collection practices by the Danish Defense Intelligence Service (FE, or DDIS in English). Moreover, when confronted by the TET, the DDIS “withheld key information” about its collection practices and even gave “incorrect information relating to the collection and disclosure of information”, according to the watchdog.

The press release by the TET said that the DDIS had carried out “operational activities” that violated Danish law and violated the privacy of Danish citizens. It also said that the illegal “operational activities” had taken place “for as many as six years”. However, the watchdog added that, given the “classified content” of the intelligence service’s mission and activities, it could “not provide further information to the public”. It is believed, however, that the controversy involves a system of mass surveillance of telecommunications, which somehow collected information exchanged domestically between Danish citizens, or between them and foreign nationals. The DDIS is forbidden by law to spy on the domestic activities of Danes.

The Danish Ministry of Defense announced on Monday that DDIS Director Lars Findsen, had been “relieved of duty for the time being”, while officials investigated a multi-volume report produced by TET investigators about the alleged improprieties by the spy agency. The ministry added that two more senior DDIS officials had been placed on leave, but said they could not be named for reasons of national security.