The country's Financial Crime Investigation Service refrains from commenting on the situation yet.
According to the information available to BNS, Stonys is a suspect in the investigation and is detained. BNS has not managed to contact his lawyer yet.
LNK News reported on Tuesday that Stonys was being questioned outside Vilnius.
Stonys is the owner of Kauno Termofikacine Elektrine and previously owned Dujotekana, an importer of gas from Russian gas giant Gazprom.