US CENTCOM says as of July 29, the CENTCOM has redirected 20 commercial vessels, disabled 2, and boarded 2 amid the US blockade against Iran

Declared blockades enforced at sea sit at the sharper end of Gulf escalation, a category in which the distinguishing feature is physical interdiction of commercial shipping rather than rhetoric or sanctions alone. The transmission channel is freight and insurance: war-risk premia on Gulf transits, rerouting around the affected area, and tanker availability tighten before crude differentials move, and episodes of this kind have historically shown up first in shipping costs and only then in the prompt end of the oil curve. The figures as stated (redirections, disablements, boardings) describe an active interdiction campaign rather than a single incident, and past blockade-style episodes have tended to persist and ratchet rather than de-escalate quickly, since each boarding raises the risk of a retaliatory response against shipping or regional assets. The distinction that matters is whether enforcement remains confined to commercial traffic or spills into confrontation with Iranian naval or proxy forces; the former has historically been absorbable, the latter is the point at which prior episodes have repriced crude and regional risk more durably. Worth noting is the source itself: a CENTCOM operational accounting of this specificity is unusual and reads as deliberate signalling. The follow-ons are any Iranian response, insurer and flag-state reactions, and whether transit volumes through the strait actually fall.