Iran has released a Marshall Islands-flagged fuel product tanker that its forces seized in the Strait of Hormuz five days ago, according to the vessel's manager.

Cyprus-based Columbia Shipmanagement said all 21 crew members of Talara were "safe and in good spirits", and that the vessel was "free to resume normal operations".

There was no immediate confirmation from Iranian authorities.

The Islamic Revolution Guard Corps (IRGC) said on Saturday that it had intercepted Talara after it was found to be "in violation of the law by carrying unauthorised cargo".

However, Columbia Shipmanagement said "no allegations were made against the vessel, her crew and the vessel's managers and owners" before its release on Wednesday morning.