Israel conducted a strike in Iran early Friday morning local time, a senior U.S. official told Axios.

Israel, which has not confirmed it launched an attack, has vowed to retaliate against Iran for a missile and drone attack on Israel. The U.S. is concerned that continued counterattacks could trigger wider regional escalation.

• An aide to Israeli Prime Minister Benjamin Netanyahu declined to comment.
• The U.S. official said Israel notified the U.S. in advance. "We were not surprised," the official said.
• The Biden administration has warned Israel that escalation with Iran wouldn't serve U.S. or Israeli interests and urged Israel to "be careful" with any retaliation, U.S. officials said.

Fars news agency, which is affiliated with Iran's Islamic Revolutionary Guard Corps (IRGC), reported explosions were heard in the city of Isfahan in central Iran near an Iranian air force base.

• Iranian state TV reported several drones were shot down by air defenses in Isfahan.
• Iran issued a notification early Friday morning local time closing the air space over western parts of the country.
• Iranian state news agency IRNA reports Iranian air defense systems were activated tonight in several places in the country.

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