New video purportedly shows masked Iranian commandos rappelling onto the British flagged ship

British officials are warning Iran there could be serious consequences if they don't release the British ship or its crew.
3:00 | 07/21/19

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Transcript for New video purportedly shows masked Iranian commandos rappelling onto the British flagged ship
Now, to dramatic video of that tanker takeover in the strait of hormuz. Newly released video showing masked Iranian commandoes rappelling on to british-flagged ship. And reaction from U.S. Officials. Good morning, Stephanie. Reporter: British officials are warning Iran there could be serious consequences if they don't release the British ship or the crew. But Iran doesn't seem to be bothered. Which in the end, it could all turn into a major international crisis. This morning, Iran is not backing down. After they seized a british-flagged oil tanker with 23 workers on the ship. You can hear the moment Iranian forces warned the crew not to resist. If you obey you will be safe. Reporter: Watch as masked troops rappel from a helicopter on to the tanker while patrol boats circle the vessel. Iranian officials say the British tanker violated international maritime laws. And hit a fishing boat Friday, failing to respond to their calls. Iran said the fishing boat crew then called military forces. The British government holding an emergency meeting Saturday. We continue to be very concerned about the safety and welfare of 23 crew members. We're calling on Iran to reverse this illegal act. Reporter: The tanker and its crew could be held until Iranians say their investigation into the alleged collision is complete. This incident comes just two days after the U.S. Claimed one of its warships downed an Iranian drone in this same area, Iran denies that. In the end, the Iranian regime has to make a decision that it wants to behave like a normal nation. If they do that, we're prepared to negotiate across a broad range of issues without preconditions. Reporter: Tensions between Iran and the U.S. Have been escalating since last year, when president trump withdrew the U.S. From the nuclear deal and imposed international sanctions on Iran. Uk officials say on Monday they'll continue to discuss further measures. As for the crew, the owners of the British tanker say they're

This transcript has been automatically generated and may not be 100% accurate.

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