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Iran harboured "serious doubts" about the sincerity of the US government's intentions, he noted, citing the "maximum pressure" campaign of sanctions that Trump restored soon after starting his second term.

These narratives have found resonance in an online audience that harbours a general distrust of mainstream media and worries about South Korea's neighbours.

According to The Dolphin Company's website, species held at the park include bottlenose dolphins, rough-toothed dolphins, sea lions, penguins, harbour seals, birds and reptiles.

In total, 45 passengers were thought to have been on-board the submarine, called Sindbad, when it sank close to the harbour.

The ferry operator said reports that the boat had hit the harbour or that water was leaking into the car deck were "categorically untrue".