Free flow of commerce was one point of understanding that the U.S. and Iran reached last week as negotiations continue on a broader nuclear agreement.

Iran attacked a cargo ship traveling through the Strait of Hormuz, possibly upending President Donald Trump's diplomatic end to the war with Iran.

Iran launched explosive-laden suicide drones at a cargo ship transiting the Strait of Hormuz on Thursday.

The free flow of commerce was one of the 14 points of understanding that the U.S. and the Iran reached.