Why Iranian ship is trending

<p>Tehran “will take the necessary action” against US forces, state news reported on Monday, after the US military captured an Iran-flagged ship headed towards a blockaded Iranian port over the weekend. CNN’s Brian Todd explains what led to the seizure of the Touska. Discover more videos, including live streams and exclusive storytelling, on our <a href="http://cnn.com/watch">Watch</a> page.</p>