World shares, US futures advance after AI fears drag Wall Street lower

European shares have opened higher after a mixed day of trading in Asia. Worries over risks linked to massive investments in artificial intelligence and a potential U.S.-Iran conflict have been weighing on major benchmarks. Tokyo's Nikkei 225 fell more than 1%. On Thursday, the S&P 500 slipped 0.3% and the Dow Jones Industrial Average dropped 0.5%. The Nasdaq composite lost 0.3%. Concern about whether AI competitors could steal customers away from various industries are roiling markets. Oil prices are climbing as both the United States and Iran signal they are prepared for war if talks on Tehran’s nuclear program fizzle out.