U.S. forces seized an Iranian cargo ship in the Strait of Hormuz, dashing hopes for a diplomatic thaw between Washington and Tehran and pushing oil toward $95 a barrel. Futures were lower ahead of the New York open, European benchmarks fell and the FTSE 100 lost ground after renewed incidents in the Gulf raised the geopolitical risk premium.

Futures react to stalled diplomacy U.S. equity futures turned lower in European trading as investors digested fresh escalation between the United States and Iran. Markets had been buoyed by a strong earnings season but proved vulnerable to political shocks. What happened in the Gulf - U.S. forces disabled and seized an Iranian cargo ship in the Strait of Hormuz after the vessel attempted to evade a blockade, the White House said. - Tehran responded by firing on several ships and escorting two into Iranian waters, according to regional accounts. - Iran halted traffic through the strait, abandoning earlier pledges to allow some vessels passage. - Mohammad Bagher Ghalibaf, the Iranian parliament speaker, said reopening the strait would be impossible while he accused the United States and Israel of continuing what he described as ceasefire violations. - Negotiators failed to reconvene over a two-week truce that had been due to end this week. Oil and safe-haven flows - Brent crude traded around $95 a barrel and U.S. West Texas Intermediate was in the mid-$80s, lifting energy stocks and raising cost worries for broader economic activity. - Oil rose from about $86 per barrel three days earlier as the waterway's closure tightened shipping flows and raised the risk premium priced into futures. - Higher energy prices increase uncertainty for consumer spending and corporate costs, which can feed through to inflation measures central banks watch closely. European and UK markets Europe reacted with a sharp risk-off tone: the Stoxx Europe 600 and the U.K.'s FTSE 100 were lower, reflecting an uneven mix of energy gains and wider equity weakness as investors priced in higher geopolitical risk.

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Negotiators failed to reconvene ahead of a two-week truce that was due to end this week.

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