Tanker giant Sovcomflot (SCF Group) has denied that any of its ships have turned off vessel tracking transmitters amid growing evidence of “dark activity” by Russian-linked tankers.

The denial comes a day after TradeWinds reported that technology firm Windward said the Moscow company’s ships were among a rising number of Russian-flag and Russian-linked tankers that have been detected carrying out dark activities, when vessels turn off or stop transmitting AIS data.