Pakistani Foreign Minister Ishaq Dar made the announcement on Sunday.
President Donald Trump announced "major combat operations" against Iran on Feb. 28, with massive joint U.S.-Israeli strikes attack targeting military and government sites, officials said.
Ayatollah Ali Khamenei was among those killed in Tehran on the first day of strikes, with his son Mojtaba Khamenei later chosen to succeed him. Iran has responded with missile and drone attacks targeting Israel, regional U.S. bases and multiple Gulf nations. Iran is also attempting to block some shipping traffic through the Strait of Hormuz.
Israel is also intensifying its long-running strike campaign against the Iran-backed Hezbollah militia in Lebanon and expanding its ground operations in the south of the country.
Watch special coverage on Nightline, "War with Iran," each night on ABC and streaming on Disney+ and Hulu.
The Israel Defense Forces said in a post to X on Monday that it had launched "a widespread wave of attacks" against Iranian government infrastructure in the capital Tehran.
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."
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.
The Iranian military said on Sunday that Tehran would seek to retaliate against U.S. energy sites and infrastructure in the Gulf region if Washington moves to strike Iranian power plants, according to Fars News Agency, a semi-official state news agency affiliated with Iran’s Islamic Revolutionary Guard Corps.
Trump said on Saturday that the U.S. would "hit and obliterate" Iranian power plants if the Strait of Hormuz wasn’t opened within 48 hours
"If Iran’s fuel and energy infrastructure is attacked by the enemy, all energy infrastructure, as well as information technology (IT) and water desalination facilities, belonging to the U.S. and the regime in the region will be targeted pursuant to previous warnings," said Lt. Col. Ebrahim Zolfaqari, a spokesperson for the Iranian Armed Forces, according to Fars.
