In this photo released by Iran's Supreme Leader's office, mourners attend funeral prayers held as part of the dayslong funeral ceremonies for the late Iranian Supreme Leader Ayatollah Ali Khamenei and members of his family at the Holy Jamkaran Mosque in Qom, Iran, Tuesday. (Office of the Iranian Supreme Leader via AP)

DUBAI, United Arab Emirates (AP) — The U.S. military launched new strikes against Iran early Wednesday, hours after three merchant ships were struck in the Strait of Hormuz, in the latest exchange of fire to threaten the interim deal to end the fighting between the two countries.

The renewed attacks were sure to add to the difficulty of the negotiations aimed at fully reopening the strait, rolling back Tehran’s disputed nuclear program and reaching a permanent end to the war launched Feb. 28.

In a statement posted to social media, U.S. Central Command said American forces launched the strikes “to impose heavy costs for targeting and attacking commercial shipping crewed by innocent civilians in an international waterway.”

“Iran’s demonstrated aggression was unwarranted, dangerous, and a clear violation of the ceasefire,” the command said in their statement.

A similar spate of Iranian attacks on shipping and U.S. retaliation occurred late last month.

Hours after the three tankers were struck by projectiles, and the United States revoked a license that had authorized the sale of Iranian oil as part of the interim deal to end the fighting between the U.S. and Iran.

The new assaults in the fuel-shipping waterway were the most in a single day since late April, according to the U.N. International Maritime Organization. The fresh attacks threatened to choke off the flow of traffic in the strait just as countries hoped to restore normal shipping practices and ease the global economic strain of the war.

A U.S. official said the license was revoked because Iran’s actions in the strait were unacceptable and needed to be met with consequences. The official spoke with The Associated Press on the condition of anonymity to share insight into the reasoning behind the move.

The Iranian Foreign Ministry condemned the U.S. move to revoke the license, saying in a statement that it violates the interim deal and that “the U.S. government bears responsibility for the consequences of this breach of commitment.”

Iran’s deputy foreign minister, Kazem Gharibabadi, also said in a post on X that the new attacks by the U.S. are a violation of that agreement.

One tanker was traveling off the coast of Oman when it was hit and caught fire, the United Kingdom Maritime Trade Operations center said. Iranian state television said the liquefied natural gas tanker came under attack after ignoring warnings but did not directly claim the assault.

The other two ships sustained some damage, but no one was injured, and both continued on their way, the U.K. maritime agency said.

Tehran, which has repeatedly declared that only its approved route through the strait is safe, is suspected of attacking other ships that have used another route close to the Omani shore.

Location details provided by the U.K. agency showed that all three attacks occurred off the coast of Oman or the neighboring United Arab Emirates, making it likely that the ships were using the route near Oman.