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Iran seizes two tankers, Advantage Sweet and Niovi, within a week in the Strait of Hormuz area

Incident Report

Fact Sheet
Date27 Apr 2023
TrackerStrait of Hormuz Tensions
TypeInterception
Location Strait of Hormuz
26.18, 56.25 (approximate)
What Happened

Iran seized two oil tankers within six days in April-May 2023. On April 27, the Iranian Navy captured the Marshall Islands-flagged Advantage Sweet, carrying Chevron-chartered Kuwaiti crude, about 40 miles east of Fujairah in the Gulf of Oman; US officials linked it to Washington's earlier seizure of Iranian oil from the tanker Suez Rajan. On May 3, IRGC Navy fast-attack craft swarmed the Panama-flagged Niovi mid-transit of the Strait of Hormuz and forced it toward Bandar Abbas. Both tankers were held for over a year before eventual release, and the pair of seizures prompted a US naval reinforcement of the strait.

Measured Footprint
Series That day Prior 30-day avg Week after vs before
Transits 84 -4% 87.5 -15% (682 → 579)
Tankers 51 -3% 52.8 -15% (414 → 350)
Cargo ships 33 -5% 34.7 -15% (268 → 229)
Daily figures from IMF PortWatch around April 27, 2023; the day's value is compared with the trailing 30-day average. Week comparisons are shown only when the series covers both full weeks.
Strait of Hormuz
Strait of Hormuz
Marker placed at sea area precision.

Activity Around the Incident

Commercial ship transits of the Strait of Hormuz, two weeks either side
April 13, 2023 — 102 transits Apr 13 April 14, 2023 — 82 transits April 15, 2023 — 74 transits April 16, 2023 — 71 transits April 17, 2023 — 77 transits Apr 17 April 18, 2023 — 82 transits April 19, 2023 — 90 transits April 20, 2023 — 127 transits 127 April 21, 2023 — 96 transits Apr 21 April 22, 2023 — 121 transits April 23, 2023 — 90 transits April 24, 2023 — 83 transits April 25, 2023 — 86 transits Apr 25 April 26, 2023 — 79 transits April 27, 2023 — 84 transits (incident day) 84 Apr 27 April 28, 2023 — 80 transits April 29, 2023 — 94 transits Apr 29 April 30, 2023 — 75 transits May 1, 2023 — 86 transits May 2, 2023 — 86 transits May 3, 2023 — 74 transits May 3 May 4, 2023 — 67 transits May 5, 2023 — 79 transits May 6, 2023 — 115 transits May 7, 2023 — 99 transits May 7 May 8, 2023 — 109 transits May 9, 2023 — 75 transits May 10, 2023 — 100 transits May 11, 2023 — 113 transits May 11
Daily counts from IMF PortWatch; the highlighted bar is the incident day, April 27, 2023.