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Strait of Hormuz Blocked by ~80 Mines; Tanker Traffic Disrupted
Occurred 18 Jun 2026·Detected 19 Jun 2026·
🇮🇷 Centre of the Strait of Hormuz, between Iran and Oman24 reportsCAT 26AA
MarineWar & Armed ConflictTrade DisruptionPolitical Violence & WarEnergy & InfrastructureMarine HullMarine CargoEnergyPolitical RiskWar Risk
Approximately 80 mines are blocking the centre of the Strait of Hormuz, halting the resumption of normal shipping despite a US-Iran memorandum of understanding. Vessels have begun exiting the Gulf via the strait, but the tanker owner trade body warns the chokepoint will remain partially closed until mines are cleared, with some ships diverting via an Omani route that carries grounding risk.
AI-generated from linked source reports. See our correction policy.
Impact verdict
High impact. Closure of the Strait of Hormuz — through which roughly 20% of global oil transits — by approximately 80 mines is a canal/strait blockage event with direct marine insured exposure. Loss pathways span marine hull, marine cargo and marine war risk: vessels already diverting via the alternative Omani route face grounding risk; residual mine threat elevates war risk pricing for owners and charterers transiting the corridor; transit disruption and energy price impact are likely even before any confirmed vessel damage. No confirmed vessel total loss or insured loss estimate is available in current reporting, so severity is bounded by the blockage itself rather than a single catastrophic loss.
View assessment methodologyHow we grade what we know -- Known · Reported · Uncertain. Methodology →
Intelligence ledger
Each line expands in place to its underlying sourced claim.
Known9 lines
Centre of the Strait of Hormuz is blocked with approximately 80 mines▾
structured lineknown
No separate sourced-claim record is available for this line yet.
Several vessels began exiting the Gulf through the strait on Thursday▾
structured lineknown
No separate sourced-claim record is available for this line yet.
A memorandum of understanding was signed between the US and Iran▾
structured lineknown
No separate sourced-claim record is available for this line yet.
Tanker owner trade body states normal shipping will not resume until mines are cleared▾
structured lineknown
No separate sourced-claim record is available for this line yet.
Vessels risk running aground by taking an alternative Omani route▾
structured lineknown
No separate sourced-claim record is available for this line yet.
A memorandum of understanding was signed between the US and Iran, providing partial diplomatic context to the strait movement.▾
us_iran_memorandum_of_understandingcontextvalid from 19 Jun 2026, 07:33Marine
Market relevance: Diplomatic backdrop influencing war risk pricing assumptions.
“Vessels have begun exiting the Gulf through the strait following a US-Iran memorandum of understanding” — The Guardian World · 19 Jun 2026, 06:57 · mainstream media
Vessels risk running aground by diverting via the alternative Omani route.▾
omani_route_grounding_riskunderwriting exposure escalationvalid from 19 Jun 2026, 07:33Marine
Market relevance: Creates an additional marine hull loss pathway separate from mine damage.
“vessels risking running aground by taking Omani route” — The Guardian World · 19 Jun 2026, 06:57 · mainstream media
Approximately 80 mines are blocking the centre of the Strait of Hormuz, preventing normal shipping from resuming.▾
strait_centre_blocked_by_minesunderwriting exposure escalationvalid from 19 Jun 2026, 07:33Marine
Market relevance: Direct trigger for marine war risk and transit disruption exposure.
“Approximately 80 mines are blocking the centre of the Strait of Hormuz” — The Guardian World · 19 Jun 2026, 06:57 · mainstream media
Several vessels began exiting the Gulf through the Strait of Hormuz on Thursday following a US-Iran memorandum of understanding.▾
vessels_exiting_gulf_through_straitcontextvalid from 19 Jun 2026, 07:33Marine
Market relevance: Confirms partial resumption of movement, but does not signal normalisation of transit.
“Several vessels began exiting the Gulf through the strait on Thursday” — The Guardian World · 19 Jun 2026, 06:57 · mainstream media
Reported4 lines
Strait centre will remain closed for 'some time'▾
structured linereported
No separate sourced-claim record is available for this line yet.
Partial closure of a chokepoint handling a significant share of global oil trade implies disruption to energy supply and trade flows.▾
transit_disruption_energy_supplycontextvalid from 19 Jun 2026, 07:33Marine
Market relevance: Secondary exposure for energy, trade disruption and political risk books.
“Approximately 80 mines are blocking the centre of the Strait of Hormuz” — The Guardian World · 19 Jun 2026, 06:57 · mainstream media
Active blockage and residual mine threat imply upward pressure on marine war risk premiums for vessels transiting the Strait of Hormuz.▾
marine_war_risk_premium_pressurepremium repricingvalid from 19 Jun 2026, 07:33Marine
Market relevance: Direct pricing implication for marine war risk underwriters.
“centre of strait will remain closed for 'some time'” — The Guardian World · 19 Jun 2026, 06:57 · mainstream media
The tanker owner trade body states that normal shipping will not resume until mines are cleared and that the centre of the strait will remain closed for 'some time'.▾
strait_partially_closed_until_mines_clearedunderwriting exposure escalationvalid from 19 Jun 2026, 07:33Marine
Market relevance: Anchors expected duration of transit disruption and war risk premium uplift.
“Tanker owner trade body says centre of strait will remain closed for 'some time', with vessels risking running aground by taking Omani route” — The Guardian World · 19 Jun 2026, 06:57 · mainstream media
Uncertain10 lines
Timeline for mine clearance operations▾
structured lineuncertain
No separate sourced-claim record is available for this line yet.
Total number of vessels delayed or diverted▾
structured lineuncertain
No separate sourced-claim record is available for this line yet.
Extent of damage to any vessels from mines▾
structured lineuncertain
No separate sourced-claim record is available for this line yet.
Scope of US-Iran memorandum of understanding terms▾
structured lineuncertain
No separate sourced-claim record is available for this line yet.
Whether mine-laying has ceased or continues▾
structured lineuncertain
No separate sourced-claim record is available for this line yet.
Scope and terms of the reported US-Iran memorandum of understanding are not detailed in current reporting.▾
mou_scope_uncertaincontextvalid from 19 Jun 2026, 07:33Marine
Market relevance: Affects assumption of whether further mine-laying is paused.
Extent of damage to any vessels from mines is unconfirmed in current reporting.▾
vessel_damage_from_mines_uncertaincontextvalid from 19 Jun 2026, 07:33Marine
Market relevance: Pending confirmation of hull/cargo losses; key for marine loss severity banding.
Total number of vessels delayed or diverted from the Strait of Hormuz is not quantified in current reporting.▾
diversion_count_uncertaincontextvalid from 19 Jun 2026, 07:33Marine
Market relevance: Limits precision of insured exposure estimates.
Timeline for mine clearance operations in the centre of the Strait of Hormuz is not yet established.▾
mine_clearance_timeline_uncertaincontextvalid from 19 Jun 2026, 07:33Marine
Market relevance: Directly bounds duration of war risk and transit disruption exposure.
“centre of strait will remain closed for 'some time'” — The Guardian World · 19 Jun 2026, 06:57 · mainstream media
Whether mine-laying has ceased or continues is not confirmed in current reporting.▾
continued_mine_laying_uncertaincontextvalid from 19 Jun 2026, 07:33Marine
Market relevance: If continued, materially extends blockage duration and war risk exposure.
Geographic Zone Matches
6 active matches
- Oman (12nm coastal buffer)Rule-basedConfidence 100%
- OFAC Sanctioned CountriesRule-basedConfidence 100%
- JWC Listed AreasRule-basedConfidence 100%
- EU Sanctions ListRule-basedConfidence 100%
- Iran (12nm coastal buffer)Rule-basedConfidence 100%
- Persian/Arabian Gulf, Gulf of Oman, Indian Ocean, Gulf of Aden and Southern Red SeaRule-basedConfidence 100%
Geographic zone matches are RiskEvents spatial/analytical indicators, not coverage determinations or Lloyd's official classifications.
Affected countries
🇦🇪 United Arab Emirates🇮🇷 Iran🇴🇲 Oman🇶🇦 Qatar🇸🇦 Saudi Arabia🇺🇸 United States
Latest developments
- Summary refreshed from cited evidence.
- ~80 mines are reported to be blocking the centre of the Strait of Hormuz, halting normal shipping. — The Guardian World
- Some vessels have begun exiting the Gulf via the strait following a US-Iran MoU. — The Guardian World
- A US-Iran memorandum of understanding has been reported as context to vessel movements. — The Guardian World
- Industry body indicates the strait centre will remain closed for 'some time' until mines are cleared. — The Guardian World
- Diverted vessels face reported grounding risk on the alternative Omani route. — The Guardian World
- Mine clearance timeline remains unclear. — The Guardian World
- No confirmed vessel damage from mines has been reported in current sources. — The Guardian World
Timeline
Status Change19 Jun 2026, 09:29
Status changed to active
evidence_trigger: developing_promotion
developing -> active
Corroboration19 Jun 2026, 09:29
Tankers' group warns that mines laid in the Strait of Hormuz still need to be cleared, posing ongoing risk to commercial shipping transiting one of the world's most critical oil chokepoints. The residual mine threat raises war risk and marine hull/cargo underwriting concerns for vessels and cargo moving through the strait.
Source: iheart.com (Mainstream Media) · View source
Status Change19 Jun 2026, 09:24
Status changed to developing
evidence_trigger: corroboration >= 2
signal -> developing
Corroboration19 Jun 2026, 09:24
The maritime shipping industry group BIMCO/Intertanko warns that mines laid in the Strait of Hormuz during recent Iran-Israel conflict remain uncleared, posing ongoing risk to commercial tanker transit through the critical chokepoint. The Strait of Hormuz handles approximately 20% of global oil shipments, and uncleared mines represent a direct threat to vessel hull, cargo, and war risk insurance markets operating in the Persian/Arabian Gulf corridor.
Source: iheart.com (Mainstream Media) · View source
Intelligence Refresh19 Jun 2026, 07:35
Initial Detection19 Jun 2026, 07:33
Initial Detection
Approximately 80 mines are blocking the centre of the Strait of Hormuz, preventing normal shipping from resuming. Vessels have begun exiting the Gulf through the strait following a US-Iran memorandum of understanding, but the tanker owner trade body warns the chokepoint will remain partially closed for some time. This represents a critical disruption to a major global oil transit route with direct implications for marine war risk, energy, and trade disruption books.
Tanker owner trade body says centre of strait will remain closed for 'some time', with vessels risking running aground by taking Omani route
Source: The Guardian World (Mainstream Media) · View source
Lloyd's classifications
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