Live updates: Trump says 'very good' Iran talks, hints at 'total resolution'

In a notice on the U.S. State Department official website, the agency is advising Americans worldwide, "and especially in the Middle East," to "exercise increased caution."

"Americans abroad should follow the guidance in security alerts issued by the nearest U.S. embassy or consulate," the statement reads.

The State Department is warning that U.S. diplomatic facilities, including those outside of the Middle East, "have been targeted."

The agency warns that groups in support of Iran "may target other U.S. interests overseas or locations associated with the United States and/or Americans throughout the world."

Officials in Abu Dhabi said in a statement that one person was injured due to falling debris from a missile attack in the Al Shoamkh area.

UAE air defences responded to incoming missile and drone threats from Iran, officials said.

The Israel Defense Forces said in a statement that it's planning to "deepen" its military actions against Hezbollah in Lebanon.

"We are now preparing to deepen the maneuver and strikes according to an orderly plan. We will not stop until the threat is removed from the borders and long-term security is ensured for the residents of the northern region," the IDF said.

"It is a long battle, and we are prepared for it," the IDF added.

Further details about the operation were not provided.

Iranian Foreign Minister Seyed Araghchi on Sunday reiterated the Iranian message that the Strait of Hormuz "is not closed" as President Trump imposed a deadline for Iran to stop its attacks on the strait or face strikes on energy infrastructure.

"Strait of Hormuz is not closed. Ships hesitate because insurers fear the war of choice you initiated - not Iran," Araghchi wrote on X. "Ships hesitate because insurers fear the war of choice you initiated - not Iran. No insurer - and no Iranian - will be swayed by more threats. Try respect."

"Freedom of Navigation cannot exist without Freedom of Trade. Respect both - or expect neither," Araghchi further said in his Sunday post.

"If Iran doesn't FULLY OPEN, WITHOUT THREAT, the Strait of Hormuz, within 48 HOURS from this exact point in time, the United States of America will hit and obliterate their various POWER PLANTS, STARTING WITH THE BIGGEST ONE FIRST!" Trump said in a post on his social media platform Saturday.

-ABC News' Victoria Beaule