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DUBAI, United Arab Emirates — Iran issued an evacuation warning Saturday for three major ports in the United Arab Emirates, including the busiest in the Middle East, openly threatening a neighboring country's non-U.S. assets for the first time as its war with the U.S. and Israel entered its third week.

Iran said the U.S. used "ports, docks and hideouts" in the UAE to launch strikes on Iran's Kharg Island, but provided no evidence. It urged people to evacuate areas where it said U.S. forces sheltered.

Hours after the threat, there was no sign of an attack on Dubai's Jebel Ali port — the Mideast's busiest — or the Khalifa port in Abu Dhabi. Associated Press images showed a fire at the third port, in Fujairah, caused by debris from an intercepted Iranian drone hitting an oil facility.

Iranian Foreign Minister Abbas Araghchi told MS NOW that the U.S. attacked Kharg Island and Abu Musa Island with low-range artillery from two locations in the UAE, Ras Al-Khaimah and a place "very close to Dubai," calling that dangerous and saying Iran "will try to be careful not to attack any populated area" there.

Iran fired hundreds of missiles and drones at Arab Gulf neighbors during the war, but said it targeted U.S. assets, even as hits or attempts were reported on civilian ones such as airports and oil fields.

On Friday, U.S. President Donald Trump said the U.S. "obliterated" military sites on Kharg Island, home to the main terminal handling Iran's oil exports. He said oil infrastructure could be next if Tehran continues to interfere with ships' passage through the Strait of Hormuz, where vessels are backed up and one-fifth of global oil supplies usually transit.

Iran's parliamentary speaker previously said strikes against the country's oil infrastructure would provoke a new level of retaliation.

As global anxiety soars over oil prices and supplies, Trump said Saturday that he hopes China, France, Japan, South Korea, the U.K. and others send warships to keep the Strait of Hormuz "open and safe." Britain in response said it was discussing with allies a "range of options" to secure shipping.

Iran's joint military command reiterated its threat to attack U.S.-linked "oil, economic and energy infrastructures" in the region if the Islamic Republic's oil infrastructure is hit.

Iran's semiofficial Fars news agency said the Kharg Island strikes caused no damage to oil infrastructure. It said they targeted an air defense facility, a naval base, the airport control tower and an offshore oil company's helicopter hangar.

U.S. Central Command said it destroyed naval mine storage facilities, missile storage bunkers and other military sites.

Israel earlier announced another wave of strikes in Iran targeting infrastructure, and said its air force hit more than 200 targets in 24 hours, including missile launchers, defense systems and weapons production sites.

A U.S. official said Friday that 2,500 more Marines with the 31st Marine Expeditionary Unit and the amphibious assault ship USS Tripoli were sent to the Middle East, adding to the military's largest buildup of warships and aircraft in the region in decades. The official spoke on condition of anonymity to discuss sensitive military plans.

Marine Expeditionary Units can conduct amphibious landings but also specialize in bolstering security at embassies, evacuating civilians and providing disaster relief. The deployment doesn't necessarily indicate that a ground operation will take place. The Wall Street Journal first reported the Marine deployment.

The Tripoli was spotted by commercial satellites sailing near Taiwan, putting it more than a week away from waters off Iran.

Earlier this past week, the Navy had 12 ships, including the aircraft carrier USS Abraham Lincoln and eight destroyers, in the Arabian Sea. The total number of U.S. service members on the ground in the Middle East isn't clear.

A missile struck a helipad  Saturday inside the U.S. Embassy compound in Baghdad. No one immediately claimed responsibility for the attack. The embassy complex, one of the largest U.S. diplomatic facilities in the world, repeatedly was targeted by rockets and drones fired by Iran-aligned militias.

There was no immediate comment from the embassy. On Friday, it renewed its Level 4 security alert for Iraq, warning that Iran and Iran-aligned militia groups previously carried out attacks against U.S. citizens, interests and infrastructure and "may continue to target them."

Meanwhile, Lebanon's humanitarian crisis deepened, with more than 800 people killed and 850,000 displaced as Israel launched waves of strikes against Iran-backed Hezbollah militants.

There is no end in sight to the fighting, as about 100,000 Israeli troops amassed along the U.N.-mandated Blue Line that divides the two countries in an anticipated ground invasion.

Many fear the Israel-Hezbollah conflict could continue beyond the Iran war.