Update : Earlier Iran released footage of the detained British-flagged oil tanker Stena Impero, but hours after the first images were revealed, more video was aired on Iranian state TV, this time showing the dramatic IRGC military raid on the vessel.

Iranian special forces troops fast-roped down to the deck via helicopter while IRGC boats circled near the vessel.

#BREAKING: #IRGC released video of seizure of Stena Impero, the #UK's Oil Tanker in #HormuzStrait yesterday. A Mi-171 transport helicopter of #IRGC Navy Aviation base at #BandarAbbas was used for heliborne & fast-roping of #IRGC Navy Special Forces on the deck of the Oil tanker. pic.twitter.com/1XQPGg8bLt — Babak Taghvaee (@BabakTaghvaee) July 20, 2019

Iran's Press TV described:

The footage shows Iranian speedboats cruising near Stena Impero tanker as a military helicopter is flying over the vessel. An Iranian marine could be heard communicating with the command center in the southern port city of Bandar Abbas. Masked Iranian commandos then rappelled on the deck of the tanker from the helicopter. The name of the ship can be seen in the video.

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Iran has released the first images of the detained British flagged oil tanker Stena Impero after its Islamic Revolutionary Guard Corps (IRGC) announced its seizure Friday in retaliation for the UK's prior capture of the 'Grace 1' off Gibraltar earlier this month.

#BREAKING #Iran’s ISNA releases the first footage of the detained #British oil tanker Stena Impero pic.twitter.com/g6SQJ9Kovk — EHA News (@eha_news) July 20, 2019

The Swedish-owned and British flagged tanker is also no longer under control of crew and hasn't been able to be contacted since being forced into Iranian waters Friday, according to a statement from its owner Stena Bulk.

"Soon after the vessel was approached by unidentified small naval craft and a helicopter during her transit of the Strait of Hormuz in international waters... the vessel suddenly deviated from her passage to Jubail and headed north towards Iran," the company said in statement.

Iran's IRNA quoted an Iranian maritime official as saying, "There are 18 Indian and five crew members from Russia, Philipines, Latvia and other countries on board of Stena Impero. The captain is Indian, but the tanker is UK-flagged."

As of Saturday morning Indian government officials have confirmed India is in contact with Tehran to secure the release of the majority Indian crew.

via Sky News

Meanwhile, the second foreign vessel which was captured Friday - Liberian flagged, UK-owned tanker 'Mesdar' - was reportedly released after being briefly boarded by Iran's military, as we detailed previously.

UK Foreign Secretary Jeremy Hunt has warned Iran of "serious consequences" if its military does not return control of the British-flagged oil tanker Stena Impero, according to Sky News. He said British action will be "robust" but also emphasized "we're not looking at military options" at this early stage.