Explainer: What is happening after U.S. "blockades" Strait of Hormuz?

CAIRO, April 15 (Xinhua) -- No vessel breached the U.S. blockade on Iran in the first 24 hours, the U.S. Central Command said on Tuesday, while ship-tracking data showed that several vessels continued to pass through the Strait of Hormuz on the same day.

That raises three questions: What is the current situation in the Strait of Hormuz? To what extent has shipping through the strait declined since the conflict b