Wednesday 3 November 2021 · below the Index · spike
Iran seizes Vietnamese tanker in Gulf of Oman
On November 3, 2021, Iran and the US disputed facts surrounding a tanker incident in the Sea of Oman. US officials told AP that Iran seized a Vietnamese-flagged oil tanker on October 24 and continued to hold it. Iran claimed its military foiled a US attempt to seize the vessel. The conflicting narratives generated significant media and public attention.
Peak 85.2 on Thursday 4 November 2021. The shaded band is the incident window.
Where the attention came from
Social-led, both over the window and on the peak day. Social here is X alone — Bluesky only joins the series from July 2024 — so its level isn't directly comparable with today's series, though its share of this incident is real.
Bar = share of the extra attention over the whole window; the tick marks the share on the peak day alone, where the two differ.
How unusual it was
This was above 83% of all days since 2020, and the highest since Friday 29 October 2021.
How far it spread
No vessel type moved — 0 of 6 vessel-type groups drew clearly more readers than usual.
Bars start at 1× — normal readership for that vessel type, the weeks before the incident. Grey = no clear lift. "Over time" shows each group's daily readers through the window; "All 12 articles" breaks the six groups back into their members.
How it was framed the frame glossary →
Lead frame: geopolitical pawn. Trade press was 11% of in-scope coverage — the story had left the trade press and gone mainstream. (Historical coverage is scored on headlines only.)
Acting, or acted upon
In 72% of coverage shipping was the thing acted upon rather than the actor; 0% of it was strongly negative in tone.
What the coverage said
- Iran Says It Blocked US Attempt to Seize Oil Tanker in Sea of Omangcaptain.com · 2021-11-03
- 2 US officials tell AP that Iran seized Vietnamese-flagged oil tanker in Gulf of Oman on Oct. 24 and still hold vesselsandiegouniontribune.com · 2021-11-03
- Alert: 2 US officials tell AP that Iran seized Vietnamese-flagged oil tanker in Gulf of Oman on Oct. 24 and still hold vesselsfgate.com · 2021-11-03
- Iran claims it has foiled 'US attempt to steal oil by blocking a tanker' in the Sea of Omandailymail.co.uk · 2021-11-03
- Vietnamese Tanker Detained by IRGC Reportedly Seen Transferring Oil to Iranian Shipsputniknews.com · 2021-11-04
- Tehran's military 'foils' US attempt to seize Iranian tanker in Sea of Oman – state media — RT World Newsrt.com · 2021-11-03
Gold rule = a national or international outlet, not a trade title.
- social = X only before Bluesky (2024-07-01); not comparable with today's series
- tier C: only a Wikipedia article, GDELT sub-vocabulary term, or social per-term query fired — not yet confirmed as a real maritime incident (Phase C naming/is_maritime_incident does that).
- coverage scored on title only (no excerpt) — measured ~8pp frame precision cost vs title+excerpt (docs/HANDOVER-incidents.md §2.3)
- coverage filtered to articles matching this incident specifically (54/54 kept) — see coverage.filter.terms
Maritime Attention Index, incident: Iran seizes Vietnamese tanker in Gulf of Oman, peak 85.2 on 4 November 2021. maritimeattentionindex.com/incidents/2021-iran-seizes-vietnamese-tanker-in-gulf-of-oman/