By Saqib Iqbal Ahmed and Harry Robertson
NEW YORK, Sept 14 (Reuters) - The U.S. dollar rose across the board on Monday as conflict in the Middle East pushed up oil prices and sent investors towards the safe-haven currency, and as investors braced for the Federal Reserve's first interest rate hike in more than two years.
Warnings from leaders of the biggest AI companies about the possible dangers of AI hurt overall risk sentiment, supporting the dollar.
The U.S. dollar index, which tracks the currency
against six major peers, was last up almost 0.6% after earlier touching 99.648, its highest since September 2.
The euro fell to a one-month low of $1.153 and was last down 0.5%, while the British pound fell 0.5% to $1.3474.
A jump in oil prices unnerved investors and sent global bond yields back towards multi-year highs, with Brent crude up 3% to $108 a barrel.
Houthi strikes on the world's biggest exporter Saudi Arabia, which came after the kingdom shut down its main pipeline for bypassing the Strait of Hormuz, added to concerns about energy supplies.
Diplomacy over the U.S.-Israeli war on Iran appeared to falter, with a meeting between Tehran and other Gulf governments postponed. Attacks on ships in the region compounded supply worries.
"Gulf developments remain concerning, and some AI-related headlines are further weighing on equities — an environment where the dollar should remain supported," said Francesco Pesole, currency strategist at ING.
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The key question for markets this week is whether the U.S. Fed will hike interest rates on Wednesday in response to the jump in energy prices that has pushed diesel to record highs and helped lift underlying inflation by more than expected in August.
Money markets on Monday pointed to a roughly 90% chance of a rate hike, up from around 60% a week ago, according to CME Group's FedWatch tool.
"The U.S. dollar has strengthened modestly at the start of this week, encouraged by building expectations that the Fed will begin tightening monetary policy," said Lee Hardman, senior currency analyst at MUFG.
Still, the dollar's recent firmness was not without risks.
"An unchanged decision from the Fed would be a shock for markets and a clear negative for the USD," Scotiabank analysts led by Shaun Osborne said in a note.
"But a 'dovish' hike which does not obviously commit to additional moves would also likely weigh on the USD," they wrote.
On Monday, the Japanese yen was notably weak, giving up some of its recent sharp gains that have been driven by rising bets on Bank of Japan rate hikes.
The U.S. dollar rose 0.9% against Japan's currency to 154.88 yen, up from last week's almost seven-month low below 153.
Rising bets on rate hikes around the world have pushed bond yields to multi-year or multi-decade highs in the U.S., Europe and Japan. So far the impact on the FX market has been relatively limited, as yields have largely moved in tandem.
Markets are all but certain the Bank of Japan will raise rates on Friday and will be looking for clues on whether more increases are coming.
Signs are emerging of a shift in market sentiment for the yen, with speculators turning to a net long position on the Japanese currency for the first time since February.
The Bank of England is expected to keep borrowing costs on hold on Thursday, but traders now expect a rate increase later this year and more in 2027 after the European Central Bank hiked last week.
In cryptocurrencies, bitcoin edged up for a second straight session, last up 0.6% to $77,805.
(Reporting by Harry Robertson in London and Ankur Banerjee in Singapore; Editing by Edwina Gibbs, Andrew Cawthorne and Jan Harvey)
