Chokepoint Data · the Strait of Hormuz crisis

Houthis seize Perim island, gaining positions on both Bab el-Mandeb channels

2026-09-11 · military · major

Houthi forces took Perim (Mayun) island in the Bab el-Mandeb strait on Friday 11 September after government forces withdrew, two Yemeni government sources told CNN, and advanced on the coastal town of Dhubab. A Houthi military spokesman said navigation through the strait remained 'safe for all' except Saudi vessels. CNN reported that Crown Prince Mohammed bin Salman had urged President Trump on 10 September to strike the Houthis and that Trump did not agree. JMIC later assessed that the Houthis held Mocha, Dhubab, Mayun/Perim, Zuqar and the Hanish islands, 'commanding both Bab el-Mandeb channels after the 10–12 September seizures'.

Brent next close -2.4% · +7 days -1.1% · transits 4.1 → 3.7 per day · reaction near an ordinary day (76.1th percentile)

Attribution caveat: 2 other major event(s) sit inside this one's ±7-day window (2026-09-08 Houthi strikes on southern Saudi cities set oil sites ablaze; Riyadh says 73 hurt; 2026-09-11 Saudi Arabia shuts East-West pipeline after drone attacks it says came from Iraq), so the reaction is not cleanly separable.

Sources

CNN · NBC News · JMIC Advisory Note Update 100 (UKMTO)

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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

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