Fars News Agency released the report, without providing further details.
The IRGC has yet to comment on the report.
Tasnim News Agency said the seized tanker had “apparently” violated maritime law.
Meanwhile, the US Navy said in a statement the IRGC seized a Panama-flagged ship.
“A dozen IRGCN fast-attack craft swarmed the vessel in the middle of the strait,” a statement said, referring to the IRGC Navy.
The tanker, Niovi, was sailing from Dubai towards Fujairah, another port in the United Arab Emirates, when it was stopped by Iranian forces, it said.
Last week, the Iranian Navy seized a Marshall Islands-flagged oil tanker in the Sea of Oman and directed it toward Iran’s territorial waters after the tanker hit an Iranian vessel and tried to flee in violation of maritime regulations.