The Short Version
US military forces did seize an Iranian-flagged cargo ship, the Touska, in an operation tied to the Strait of Hormuz blockade — a fact confirmed by AP, Reuters, Bloomberg, CNN, Al Jazeera, and official CENTCOM footage. The only caveat is geographic: most reporting places the actual seizure in adjacent waters (Gulf of Oman/North Arabian Sea) rather than strictly inside the strait, though several major outlets use 'in the Strait of Hormuz' framing.