A US court has sentenced Greece's Avin International and a shipowning affiliate to pay a total of $4m in penalties, according to the US Department of Justice.

The fines, plus a four-year probation, came after the Vardinoyiannis Group company and one-ship owner Nicos IV Special Maritime Enterprises pleaded guilty in November to obstruction of an agency proceeding, failure to report a discharge of oil and three counts of negligent discharge of oil.