P&C INTELLIGENCE REGIONAL SECURITY ALERT

Repeated Tanker Attacks and Iranian Surveillance Increase Hormuz Shipping Risk

Multiple tanker strikes, depressed commercial traffic, AIS suppression and persistent Iranian small-craft activity are increasing shipping risk across the Strait of Hormuz operating environment.

1 SEPTEMBER 2026 STRAIT OF HORMUZ / OMAN MARITIME / REGIONAL SECURITY

PRIORITY HIGH

STATUS DEVELOPING

REGION HORMUZ / OMAN

CATEGORY MARITIME / REGIONAL SECURITY

Monitoring Focus: Repeated commercial-vessel attacks, inbound and outbound transit exposure, Iranian maritime surveillance, AIS suppression and changes in commercial operability.

Situation

The maritime-security environment around the Strait of Hormuz has deteriorated further following a sequence of attacks against tankers operating around the waterway and its Omani approaches.

UK Maritime Trade Operations reported on 1 September that a tanker had been struck by three unknown projectiles approximately 17 nautical miles east of Khasab, Oman, while completing an outbound transit of the Strait of Hormuz. No casualties or environmental impact were reported and authorities are investigating. ^[1]

The incident occurred at approximately 2000 UTC on 31 August and followed another tanker strike involving a vessel travelling in the opposite direction less than two days earlier. ^[1]

UKMTO Warning 122-26 reported that a tanker had been struck by an unknown projectile while transiting inbound through the Strait approximately 12 nautical miles north of Khasab at 2053 UTC on 29 August. No casualties or environmental impact were reported. ^[2]

The two Khasab incidents are operationally significant because they show that the current threat is affecting both inbound and outbound commercial movements through the Strait.

Current Commercial Picture

Commercial movements remain severely depressed. Preliminary Kpler data reported by Reuters showed only five visible commodity vessels transiting Hormuz on 31 August, compared with a ten-day average of approximately 14. Four vessels entered the Strait and only one exited. ^[3]

No liquid tankers were included among those five visible movements. The inbound traffic consisted of an empty handy-sized gas tanker and three loaded dry-bulk vessels. ^[3]

These figures remain incomplete because vessels crossing with their AIS transponders switched off are excluded from visible counts. AIS suppression therefore continues to create a widening gap between observable traffic and actual traffic. ^[3]

Visible traffic had already been volatile before the latest attack. Reuters reported seven commodity-vessel transits on 27 August, down from 17 the previous day and below the ten-day average of 15. ^[4]

Recent Tanker Incident Sequence

24 AUG

Oil Tanker Disabled off Oman

UKMTO Warning 120-26 reported an oil tanker struck by an unknown projectile approximately 9NM northeast of Ash Shishah, Oman. The projectile damaged the engine room and disabled the vessel. Crew were reported safe; environmental impact was initially unknown. ^[5]

27 AUG

Tanker Hit in Strait of Hormuz

UKMTO Attack 121 reported a tanker struck by an unknown projectile in the Strait of Hormuz. The strike caused a fire that was subsequently extinguished. All crew were reported safe and accounted for, with no environmental impact reported. ^[6]

29 AUG

Inbound Tanker Struck North of Khasab

UKMTO Warning 122-26 reported a tanker struck by an unknown projectile approximately 12NM north of Khasab while transiting inbound through the Strait of Hormuz. ^[2]

30 AUG

Tanker / Military Forces Incident

UKMTO Advisory 123-26 reported an incident involving a tanker and military forces in the Indian Ocean. UKMTO provided limited details and said authorities were aware and investigations remained ongoing. ^[7]

31 AUG

Outbound Tanker Struck East of Khasab

UKMTO Warning 124-26 reported that a tanker completing an outbound Hormuz transit was struck by three unknown projectiles approximately 17NM east of Khasab. No casualties or environmental impact were reported. ^[1]

THREAT LEVEL High

RECENT TANKER STRIKES Repeated

TRANSIT EXPOSURE Inbound & Outbound

VISIBLE TRAFFIC Severely Depressed

AIS RELIABILITY Degraded

OPERABILITY Severely Constrained

What Remains Unconfirmed

UKMTO has not publicly attributed the projectiles involved in the recent tanker incidents. The attacking platform, weapon type and responsible actor therefore remain unconfirmed.

Vessel identities, ownership, cargoes and detailed damage assessments have also not been publicly established in several of the incidents.

The available reporting establishes a repeated incident pattern but does not demonstrate that all of the attacks were conducted by the same actor or using the same method.

Likewise, although IRGC small-craft concentrations provide substantial surveillance and interception capability, available evidence does not establish that every observed small craft is tasked specifically with scouting individual merchant vessels.

IRGC Surveillance and AIS-Off Vessels

AIS suppression is increasingly relevant to the Hormuz operating picture, but switching off AIS does not make a vessel invisible to forces operating locally inside the Strait.

Windward remote-sensing analysis identified approximately 201 IRGC Navy small craft around Larak Island on 30 May, describing the concentration as the densest single-day IRGC small-craft footprint it had recorded across the corridor. ^[8]

Windward assessed that the Larak deployment provided overlapping coverage of the chokepoint and northern approaches while simultaneously straddling both inbound and outbound deep-draft transit lanes. ^[8]

During the same collection window, three commercial vessels crossed the Strait without AIS: an inbound container vessel, an outbound VLCC-class tanker and an outbound product tanker. ^[8]

The US Maritime Administration separately warns that Iranian forces have historically used small boats and helicopters during commercial-vessel boarding operations. MARAD also warns that Iran continues to threaten and conduct attacks against commercial vessels and that GNSS spoofing, interference and jamming remain significant across the Gulf, Hormuz and Gulf of Oman. ^[9]

The analytical implication is important: AIS suppression reduces public visibility, not necessarily Iranian visibility. A vessel may disappear from open-source tracking while remaining observable through patrol craft, visual surveillance, radar and other local maritime-domain awareness systems.

Why It Matters

The latest sequence demonstrates that the risk is not confined to a particular direction of passage. Tankers have now been struck while travelling both inbound and outbound through the Hormuz operating environment.

REPEATED ATTACKS → BOTH TRANSIT DIRECTIONS → AIS SUPPRESSION → LOCAL SURVEILLANCE → COMMERCIAL RISK

This complicates assumptions that vessels can materially reduce exposure simply by changing transit direction, timing or AIS behaviour.

It also reinforces an increasingly important distinction between the Strait being physically navigable and being commercially operable.

Commercial Shipping Adaptation

Commercial adaptation increasingly extends beyond AIS suppression. Saudi Aramco has increased crude availability outside Hormuz through ship-to-ship transfers off Fujairah and Sohar.

Reuters reported that at least four million barrels had been sold to Chinese buyers through these arrangements, with some VLCC transfers conducted while tracking systems were switched off. ^[10]

This suggests producers and commercial operators are increasingly adapting around the chokepoint risk rather than waiting for ordinary Hormuz operating conditions to return.

The longer such behaviour persists, the more important these alternative loading patterns become as an indicator of structural rather than temporary disruption.

Wider Regional Implications

The deterioration in Hormuz is increasingly affecting energy-market expectations. Reuters reported that renewed US-Iran hostilities and the continuing threat to shipping pushed Brent crude above $91 per barrel early on 1 September. ^[11]

The importance of alternative infrastructure is also increasing. Gulf states are accelerating consideration of pipeline, port and logistics capacity that could reduce dependence on Hormuz, including greater use of Red Sea export routes and ports on the UAE's eastern seaboard. ^[12]

P&C ASSESSMENT

The sequence of tanker attacks between 24 and 31 August represents a deterioration from isolated vessel incidents toward a persistent threat environment affecting commercial movements around Hormuz.

Of particular significance is the occurrence of attacks against both inbound and outbound tankers near Khasab within approximately 48 hours. This reduces the value of transit direction as a meaningful risk discriminator.

AIS suppression similarly provides only partial risk mitigation. It can reduce visibility to public tracking platforms and outside observers but does not remove a vessel from the surveillance environment of a state actor operating patrol craft, coastal sensors and other maritime-domain awareness capabilities around the chokepoint.

Commercial adaptation through Fujairah and Sohar STS activity further indicates that operators are beginning to respond to the cumulative risk environment rather than treating individual attacks as isolated events.

The central intelligence requirement is therefore shifting from whether individual attacks cause significant damage toward whether their cumulative effect is changing normal commercial behaviour.

Hormuz remains physically navigable, but commercial operability remains severely constrained by repeated attack risk, surveillance exposure, depressed traffic and uncertainty over vessel-specific targeting.

Indicators to Watch

Additional projectile, mine, drone or small-craft attacks against merchant vessels.

Further incidents affecting both inbound and outbound Hormuz traffic.

IRGC small-craft concentrations around Larak, Qeshm, Hormuz Island and the main traffic lanes.

Evidence that AIS-off vessels are being identified, followed, intercepted or selectively targeted.

Further reductions in visible commercial or tanker transits, particularly liquid tanker movements.

Expansion of Fujairah and Sohar alternative loading or STS activity.

New operator suspensions, voyage restrictions, freight increases or war-risk insurance limitations.

Evidence of a consistent vessel-selection or targeting methodology.

Changes in IRGC communications, vessel-reporting requirements or attempts to direct commercial traffic.

Increasing divergence between publicly visible AIS traffic and estimated physical vessel movements.

Assessment Confidence

HIGH confidence that UKMTO recorded repeated tanker incidents around Oman and the Strait of Hormuz between 24 and 31 August.

HIGH confidence that tankers have been struck while travelling both inbound and outbound through the Strait.

HIGH confidence that visible commercial traffic remains materially below recent averages.

HIGH confidence that Iranian forces retain substantial local maritime-surveillance and interception capability around Hormuz.

MODERATE confidence that IRGC small-craft deployments are being used systematically to identify or monitor individual AIS-dark vessels. Available evidence supports the capability but does not establish the specific tasking of every observed craft.

LOW confidence in attribution of the individual projectile attacks unless and until authorities release additional evidence.