Dow Jones futures fell sharply early Friday, along with S&P 500 futures and Nasdaq futures, amid Israeli strikes in Iran. Treasury yields tumbled while crude oil jumped. But markets pared overnight gains and losses somewhat.

Israel carried out a military operation in Iran overnight, according to multiple reports. Iran state TV cited reports of "big explosions" near Isfahan, home to several military bases as well as some key nuclear facilities. But state media also said there were "no reports" of a foreign attack.

Israel had said it would respond to Iran's April 13 missile and drone attack vs. the country. Tehran had said in recent days that it would respond massively.

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