Blaming Israel, Iran Vows Revenge for Blackout at Nuclear Site

The Iranian foreign minister, Mohammad Javad Zarif, vowed revenge against Israel on Monday morning, a day after a blackout at an Iranian nuclear enrichment site was attributed to an Israeli attack.

Mr. Zarif’s comments highlight the risk of escalation in a yearslong shadow war between Iran and Israel. They also threaten to overshadow efforts in Vienna to encourage Iran to reimpose limits on its nuclear program in exchange for the lifting of American sanctions.