San Francisco Frontiers - Oil extends gains, stocks mostly down as Trump issues fresh Iran warning

The latest strikes between the foes has further stoked worries about inflation that has put pressure on central banks to hike interest rates, which has in turn jolted equity markets.

After six months of war, the conflict remains at an impasse, with Tehran keeping the strategic Strait of Hormuz closed and Washington continuing a counter-blockade of Iranian ports.

The United States carried out strikes on an Iranian island in the waterway on Sunday, with Tehran quickly retaliating by attacking US military targets in the Middle East.

The exchange raised fears of a return to major hostilities, with the US president vowing to respond.

"We're going to hit them hard," Trump said, according to a Fox News reporter who spoke to him briefly. "There will be a response."

US officials said it hit rocket launchers on the island of Larak to prevent Tehran planting mines in the strait, while Iran targeted US forces in Jordan and the United Arab Emirates.

The exchange of fire came after weeks of relative calm, with the Trump administration recently pivoting to "economic warfare".

US Treasury Secretary Scott Bessent said: "We are going to continue exerting pressure, and we've had very good discussions here already."

He told reporters at a G20 meeting in North Carolina that a turning point in the pressure campaign could come "within weeks or months".

Both main crude contracts rose around 1.5 percent Tuesday, extending the previous day's jump of more than two percent.

"The calibrated nature of the initial actions suggests neither side is actively seeking a return to sustained conflict, but stalled talks and the strategic importance of keeping the Strait open leave the situation vulnerable to further escalation," said National Australia Bank's Rodrigo Catril.

Trump will be meeting oil refining executives on Tuesday in a bid to tame soaring US domestic gas prices that have been a political headache for his Republican Party heading into November's midterm elections.

Stocks mostly fell, with traders now awaiting the release of key data this month ahead of the Federal Reserve's policy meeting on September 16.

Tokyo, Hong Kong, Shanghai, Sydney, Singapore, Mumbai, Bangkok and Wellington were all down, though Seoul, Taipei, Manila and Jakarta rose.

London slipped as it reopened after a long weekend, while Frankfurt was also down. Paris edged up.

The jobs and consumer price index reports could play a major role in whether the bank hikes rates, with bets on an increase surging after boss Kevin Warsh's hawkish speech on Friday.

Expectations for elevated inflation and rising borrowing costs pushed the yield on 10-year US Treasuries to their highest level since January 2025.

That has bled into Asia, with 10-year Japanese government bond yields touching a 30-year high of three percent.

The yen weakened against the dollar even after US Treasury Secretary Scott Bessent told CNBC he expected Japan to act to support the unit, which has lost half the gains made in a historic joint intervention after it hit a 40-year low.

The comments were taken as a hint to the Bank of Japan to tighten monetary policy when it meets this month.

In company news, fast-fashion giant Shein fell 10 percent on its long-awaited Hong Kong trading debut, having raised $1.7 billion in a high-profile initial public offering. It later pared the losses to sit around four percent lower.

And shares in MediaTek soared nearly 10 percent after US tech giant Nvidia announced it has injected $3.5 billion into the Taiwanese chipmaker.

- Key figures at around 0810 GMT -

West Texas Intermediate: UP 1.5 percent at $87.02 per barrel

Brent North Sea Crude: UP 1.4 percent at $91.74 per barrel

Tokyo - Nikkei 225: DOWN 0.2 percent at 66,215.34 (close)

Hong Kong - Hang Seng Index: DOWN 0.9 percent at 25,329.73 (close)

Shanghai - Composite: DOWN 0.2 percent at 3,979.89 (close)

London - FTSE 100: DOWN 0.5 percent at 10,772.62

Dollar/yen: UP at 160.00 yen from 159.77 yen on Monday

Euro/dollar: DOWN at $1.1599 from $1.1618

Pound/dollar: DOWN at $1.3534 from $1.3550

Euro/pound: DOWN at 85.66 pence from 85.74 pence

New York - Dow: DOWN 0.7 percent at 53,185.90 (close)

C.Diaz--SFF