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'More confrontational': Iran's new hardline security leadership
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US national debt exceeds $40 trillion for first time
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UK summons Israeli envoy over West Bank settlement project
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Brazilian narco violence spills over into tranquil Bolivia
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Trump vows 'tremendous' economic costs on Iran partners
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Trump's devoted 'human printer' in media glare
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Germany, France, UN condemn far-right Israeli minister's 'inhumane' Gaza remarks
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Top seed Zverev bundled out by Paul in rain-hit Cincinnati upset
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Prince Harry and Meghan moving back to UK: British press
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WADA pledges vigilance on Russian athletes ahead of 2028 Olympics
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Lee, Baena guide Atletico to opening Liga win over Malaga
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NASA satellite rescue mission fails
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Ecuador intel chief, five Americans killed in Kenya helicopter crash
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Cobolli halts Jodar to reach Cincinnati quarter-finals
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Robinson and Tongue share match ball after dismissing Pakistan
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As election looms, Netanyahu puts Turkey in Israel's crosshairs
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Israel army admits firing on car in death of five-year-old Hind Rajab
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McIlroy questions LIV stars 'value' as talk of PGA return builds
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Honduras places 80% of country on El Nino drought alert
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'Breakthrough' mRNA cancer drug curbs melanoma in large trial
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Some of Meta's safety tools were 'designed to fail': witness
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Many US Fed policymakers back interest rate hikes if inflation stays high
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PSG Ligue 1 opener moved over state of Parc des Princes pitch
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Robinson and Tongue star as Pakistan collapse in England opener
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UK PM launches bid to help homeless, donating part of his wages
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All Blacks must get 'everything right' to beat Springboks, says legend Fitzpatrick
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Golden Shoe winner Kane hopes for Ballon d'Or after 'best season ever'
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Robinson and Tongue star as Pakistan all out for 171 in England opener
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Kyiv's ex-defence chief makes risky bet by venturing into electoral grounds
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Lake Zurich sees water level hit record low amid drought
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Coventry have survival inspiration says Lampard
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Merck and Moderna's tailored cancer drug curbs melanoma recurrence in trial
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Reijnders leaves Man City for Saudi's Al Qadsiah
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Referees chief Webb wants clamp-down on Premier League set-piece grappling
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Trump says will meet North Korea's Kim later this year
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Robinson makes history as Pakistan collapse against England
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Stocks waver, dollar drops as US Treasury moves to lower bond yields
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Alvarez can win back Atletico fans in two games: club chief
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France recalls rare disease drug Tavneos after deaths
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Oldest human brain cells grown in lab 'recorded passage of time'
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Arsenal agree to sign Villa defender Konsa: reports
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7,300 excess deaths and counting in France's historically hot summer
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Evacuation orders lifted in Belgian wildfire zone
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Ukraine MPs approve new defence minister after divisive reshuffle
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UK media skewered for 'hounding' black academic
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North Korea leader's sister says 'unaware' of reported Kim-Trump communication
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More than 7,300 excess deaths in France's historically hot summer so far
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Russia, Ukraine exchange 103 captured soldiers each
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US socialists score shock Florida win as Trump picks stumble
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Sainz signs new contract with F1 team Williams
Asian stocks hit by fresh tech fears as gold retreats from peak
Asian stocks sank Friday amid fresh worries over vast investments in artificial intelligence, gold and silver tumbled after hitting multiple record highs and oil retreated on hopes for an easing of US-Iran tensions.
Markets have endured a rollercoaster ride this week as traders weathered a weaker dollar, Donald Trump's threats against Tehran, a resumption of tariff warnings and a possible US government shutdown.
Fresh optimism in the tech sector about the future of AI has provided support, however, with healthy earnings from companies including Meta, Samsung and SK hynix providing much cheer.
However, the positivity took a hit Thursday after Microsoft announced a surge in spending on AI infrastructure and revived concerns that companies could take some time before seeing a return on their investments.
There are also fears that firms' valuations may be a little too stretched and markets could be in a bubble, having soared in recent years to record highs on the back of a tech-fuelled rally.
"Microsoft suffered its worst session since the COVID‑era crash, falling 12 percent and accounting for over two‑thirds of the S&P 500's decline," wrote National Australia Bank's Rodrigo Catril.
"Concerns centred on rising investment spending, slower Azure (cloud service) growth, and a longer runway to monetising AI."
Wall Street ended mostly in the red, with the Dow the only advancer.
And Asia also struggled.
Hong Kong and Shanghai fell more than one percent while Tokyo, Sydney, Singapore, Taipei and Manila were also down. Seoul and Wellington rose.
Jakarta saw more losses but seemed to be stabilising after a rout over the previous two days sparked by index compiler MSCI calling on regulators to look into ownership concerns.
MSCI also said it would hold off adding Indonesian stocks to its indexes or increasing their weighting, while there are concerns it could announce a downgrade from emerging market to frontier market, which could spark an outflow of foreign capital.
Gold was also in retreat, sitting around $5,200 an ounce, a day after topping out above $5,595. Silver was at $110 from a peak of more than $121.
The previous metals were also weighed by a slight uptick in the dollar, having tumbled on Trump appearing to be happy to see the world's reserve currency weaken despite the potential risk of pushing up US inflation.
Investors are keeping tabs on developments in the Middle East after the US president sent an "armada" to the region and warned Iran of possible strikes if it did not reach a fresh nuclear deal.
Both main contracts were down more than one percent, having spiked as much as five percent Thursday.
Still, concerns remain about a conflict in the crude-rich region, which would send prices soaring, also putting upward pressure on inflation.
- Key figures at around 0310 GMT -
Tokyo - Nikkei 225: DOWN 0.9 percent at 52,923.12 (break)
Hong Kong - Hang Seng Index: DOWN 1.4 percent at 27,564.02
Shanghai - Composite: DOWN 1.3 percent at 4,102.41
West Texas Intermediate: UP 1.5 percent at $64.14 per barrel
Brent North Sea Crude: DOWN 1.1 percent at $69.91 per barrel
Euro/dollar: DOWN at $1.1917 from $1.1962 on Thursday
Pound/dollar: DOWN at $1.3754 from $1.3800
Dollar/yen: UP at 153.84 yen from 153.04 yen
Euro/pound: DOWN at 86.64 pence from 86.67 pence
New York - Dow: UP 0.1 percent at 49,071.56 (close)
London - FTSE 100: UP 0.2 percent at 10,171.76 (close)
J.AbuShaban--SF-PST