Vessel incidents, shipping disruption and diplomacy around the Strait of Hormuz, with official records beside reported claims.
Selected maritime incidents, official assessments and diplomatic developments from 2019 through 3 November 2026. Recent coverage is denser but not exhaustive. Attack reports, government claims, shipping disruption and verified traffic data remain distinct.
Two tankers are attacked near the strait
Front Altair and Kokuka Courageous were damaged in the Sea of Oman near the Strait of Hormuz.
The event date predates the IMO release. This entry does not establish responsibility for the attacks.
Iran seizes the Stena Impero tanker
The UK government said Iranian forces intercepted the British-flagged tanker while it was passing through the Strait of Hormuz.
- UK Foreign & Commonwealth Office: Situation in the Gulf: Foreign Secretary statement to Parliament · Government statement; involved party
MSC Aries is boarded and diverted
MSC said Iranian authorities boarded MSC Aries and diverted it, with 25 crew members aboard.
- Seatrade Maritime: Iran seizes large container ship MSC Aries in Strait of Hormuz · Industry reporting; company account
EIA reports that maritime traffic remains unblocked
The US energy agency reported no blockage at that time and estimated 2024 oil transit at roughly 20 million barrels a day.
A dated 2025 assessment cannot establish conditions in the later 2026 conflict.
- US Energy Information Administration: Amid regional conflict, the Strait of Hormuz remains critical oil chokepoint · Government statistical assessment
Major shippers suspend Hormuz shipments as war begins
Reuters reported tanker owners and energy traders suspending shipments after US–Israeli strikes on Iran and Iranian statements restricting navigation.
Suspensions, Iranian closure claims and measured traffic volumes are different forms of evidence; this entry does not imply every vessel stopped.
- Reuters via Investing.com: Oil and gas majors and traders suspend shipments via Hormuz, sources say · Agency reporting; trading sources
US begins a blockade targeting Iranian ports
CENTCOM announced a blockade of vessels entering or leaving Iranian ports. Reuters reported its implementation after negotiations failed to produce a deal.
CENTCOM said traffic to and from non-Iranian ports would not be impeded. A port blockade is not synonymous with a complete closure of the strait.
- US Central Command: U.S. to Blockade Ships Entering or Exiting Iranian Ports · Military announcement; involved party
- Reuters via Investing.com: US begins blockade of Iran’s ports, Tehran threatens retaliation · Agency reporting
Washington and Tehran announce Qatar delegations
The US and Iran separately announced plans to send delegations to Qatar, while disagreeing about whether direct talks had been agreed.
- AP News: US and Iran pause strikes but disagree over next steps on talks · Reporting; contrasting party accounts
Iran announces plans for a new exclusion zone
AP reported an Iranian official’s plan for an exclusion zone near Hormuz.
This is a reported plan, not proof of the zone’s legal status or implementation. Headline metadata supports this limited statement.
- AP News via Google News: Iran says it plans to announce a new exclusion zone near the Strait of Hormuz · Headline record; involved-party announcement
A new wave of attacks hits commercial shipping
Reuters reported multiple tanker incidents and UKMTO alerts. Iran claimed attacks after US forces struck Iranian oil tankers; a vessel charterer reported a seafarer killed.
The number and responsibility claimed by Iran were not treated as independent confirmation of each reported incident.
- Reuters via StreetInsider: Iran and US hit tankers in biggest wave of attacks on shipping since war began · Agency reporting; maritime alerts and party claims distinguished
Iran–Oman understanding falls short of immediate reopening
Reuters relayed an Iranian source’s account that an understanding with Oman set a possible basis for reopening, but would not reopen the strait immediately.
The source describes negotiating terms. It is not an independent traffic assessment.
- Reuters via StreetInsider: Iran-Oman understanding does not provide for immediate reopening of Strait of Hormuz, Tasnim reports · Agency report relaying Tasnim’s Iranian source