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Oil prices climb again as Iran tensions fuel supply fears

Brent briefly topped $91 as traders weighed a stalled U.S.-Iran truce and a 5-to-1 drop in Strait of Hormuz tanker traffic, data showed.

  • On Tuesday, August 18, the US-Iran truce expired, prompting Tehran to shift to a "fully offensive" military posture as oil prices crept higher and bond yields rose.
  • The shaky 60-day truce between the US and Iran ended without the usual "soothing words" from President Trump regarding an imminent resolution, ING analysts noted.
  • Brent crude futures climbed to roughly $91 a barrel as supply concerns intensified, while the 30-year Treasury yield closed at a fresh 19-year high of 5.31%.
  • Westpac analysts reported markets adopted a "generally risk-off tone" as Trump reaffirmed he would not extend the truce with Iran, complicating investor sentiment.
  • Iran has intensified its hardline approach in recent weeks, striking tankers in the Strait of Hormuz, following Trump's threat to bomb Oman if it "gets in the way" of US peace efforts.
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Brent crude oil prices traded above $90 per barrel on concerns about risks related to supply disruptions.

·Tehran, Iran (Islamic Republic of)
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Bloomberg broke the news in New York, United States on Sunday, August 16, 2026.
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