Iran has released the oil cargo of a Greek-owned, Marshall-Islands-flagged tanker it seized in the Gulf of Oman earlier this year, a shipping source told Reuters on Thursday.The vessel, M/T St. Nikolas, is still being held by Iran, the source added.<p><p>https://www.marinelink.com/news/iran-releases-oil-carried-tanker-st-515473</p></p>