Chokepoint Data · the Strait of Hormuz crisis

Islamabad Talks collapse; US announces blockade of Iranian ports

2026-04-12 · military · major

US-Iran negotiations in Islamabad (from April 11) ended without agreement, with Vice President Vance leaving Pakistan saying talks had not led to an agreement. CENTCOM announced a blockade of Iranian ports, applying to vessels of all nations entering or departing Iranian ports, beginning Monday April 13.

Brent next close +3.5% · +7 days -17.2% · transits 4.4 → 8.4 per day · reaction near an ordinary day (88.0th percentile)

Attribution caveat: 3 other major event(s) sit inside this one's ±7-day window (2026-04-08 US and Iran agree two-week ceasefire tied to reopening Hormuz; 2026-04-17 Iran declares strait 'completely open'; contradicted same day; 2026-04-18 Iran re-closes Strait of Hormuz, fires on merchant ships), so the reaction is not cleanly separable.

Sources

NPR · INSS

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Computed, not asserted — every number here is derived from public data: official EIA Brent closes via FRED, IMF PortWatch transit counts, Polymarket and Kalshi odds, and source-linked curated events. Method and caveats · Atom feed · llms.txt

https://chokepointdata.com/event/2026-04-12-islamabad-talks-collapse-us-announces-blockade-of-iranian-po/