Iran’s Islamic Revolution Guards Corps (IRGC) has warned that other Greek tankers currently in the Persian Gulf could be detained as the dispute between the two nations continues about the fate of an Iranian oil cargo onboard a Russian-flagged tanker that was seized in Greece in April.

Iranian forces detained two Greek-flagged suezmax tankers, Delta Poseidon and Prudent Warrior, on Friday and shortly after, relayed through local media that 17 Greek tankers could be seized if the Iranian ship, Lana, and confiscated crude oil detained earlier is not returned.