Washington –

Iran has been unable to open the Strait of Hormuz to more shipping traffic because it cannot locate all of the mines it laid in the waterway and lacks the capability to remove them, according to U.S. officials.

The development is one reason Iran has not been able to quickly comply with the Trump administration’s admonitions to let more traffic pass through the strait. It is also potentially a complicating factor as Iranian negotiators and a U.S. delegation led by Vice President JD Vance meet in Pakistan this weekend for peace talks.

Iran used small boats to mine the strait last month, soon after the United States and Israel began their war against the country. The mines, plus the threat of Iranian drone and missile attacks, slowed the number of oil tankers and other vessels passing through the strait to a trickle, driving up energy prices and providing Iran with its best leverage in the war.