Why are some ships going through the Strait of Hormuz during a blockade?

(CNN) The United States’ blockade of Iranian ports has been “fully implemented” and put a halt to most of Tehran’s economic activity in just a day and a half, the head of US Central Command said Wednesday.

“An estimated 90% of Iran’s economy is fueled by international trade by sea. In less than 36 hours since the blockade was implemented, US forces have completely halted all economic trade going into and out of Iran by sea,” Adm. Brad Cooper said in a statement on social media.

US Central Command (CENTCOM) said earlier no vessels have breached the blockade since its implementation.

At the same time, reports are emerging of some commercial traffic transiting the Strait of Hormuz, the strategic chokepoint between Iran and Oman through which 20% of the world’s oil exports and 80% of Iran’s oil exports travel.

https://www.cnn.com/2026/04/15/middleeast/iran-blockade-explainer-analysis-intl-hnk-ml