This satellite image provided by European Space Agency shows an apparent oil spill in the Persian Gulf off the western side of Kharg Island, Iran’s main crude oil export terminal, on Wednesday. (European Space Agency via AP)

DUBAI, United Arab Emirates (AP) — U.S. forces fired on and disabled two Iranian oil tankers on Friday after exchanging fire with Iranian forces in the Strait of Hormuz overnight. The United Arab Emirates, meanwhile, reported another Iranian missile and drone attack.

The attacks cast more doubt on a tenuous month-old ceasefire that the United States has insisted is still in effect. Washington is awaiting an Iranian response to its latest proposal for a deal to end the war, reopen the strait and roll back Tehran’s disputed nuclear program.

U.S. Secretary of State Marco Rubio said he hopes to receive “a serious offer” from Iran later Friday.

The U.S. military said Friday that its forces had disabled two Iranian tankers that were trying to breach an American blockade of Iran’s ports. Hours earlier, the military said it thwarted attacks on three Navy ships and struck Iranian military facilities in the strait.

Iran has mostly blocked the critical waterway for global energy since the U.S. and Israel launched the war on Feb. 28, causing a global spike in fuel prices and rattling world markets. The U.S. has imposed its own blockade of Iran’s ports.

The UAE’s Defense Ministry meanwhile said three people were wounded after air defenses engaged two ballistic missiles and three drones launched by Iran. It was not clear if all were successfully intercepted.

The U.S. military posted video of the two Iranian tankers as their smokestacks were struck by an American fighter jet on Friday. Earlier in the week, an American military jet shot out the rudder of a tanker the U.S. military said was attempting to breach its blockade.

Late Thursday, the U.S. military said it thwarted Iranian attacks on three Navy ships in the Strait of Hormuz and struck Iranian military facilities in response. It said no American ships were hit.

“They threaten Americans, they are going to be blown up,” Rubio told reporters Friday.

Iran’s Foreign Ministry condemned what it called “hostile” U.S. military action, saying it violated the ceasefire. “Every time a diplomatic solution is on the table, the U.S. opts for a reckless military adventure,” Iranian Foreign Minister Abbas Araghchi posted on X.

A U.S. strike overnight killed at least one sailor and injured 10 others aboard a cargo vessel that caught fire, a news agency affiliated with Iran’s judiciary reported. It was not clear if the ship was one of the two tankers the U.S. acknowledged striking.

U.S. President Donald Trump has insisted the ceasefire is holding. He also has reiterated threats to resume full-scale bombing if Iran doesn’t accept an agreement to reopen the strait and roll back its nuclear program.

Pakistani Prime Minister Shehbaz Sharif said his country has been in contact with the U.S. and Iran “day and night” in an effort to extend the ceasefire and reach a peace deal.

Satellite images reviewed by The Associated Press show what appears to be an oil slick in the Persian Gulf emanating from the western side of Kharg Island, Iran’s main crude export terminal.

Images taken Friday show the slick covering about 27 square miles and appear to show oil still leaking from the terminal, said Ami Daniel, CEO of maritime intelligence firm Windward AI.

Daniel estimated that the equivalent of roughly 80,000 oil barrels has spilled from Kharg Island since the slick was first detected by satellite images Tuesday. It’s unknown whether the spill was caused by a malfunction, an airstrike or something else.