The United States widened its air campaign against Iran early Friday, striking additional bridges, electrical infrastructure and toppling a tower at a key Iranian port as President Donald Trump escalated pressure on Tehran to loosen its grip on the Strait of Hormuz.

Iran responded by launching fresh missile attacks at U.S. allies across the Middle East, including Qatar, a key mediator in the conflict.

A month-old interim ceasefire has collapsed, giving way to days of escalating exchanges between U.S. and Iranian forces as both sides vie for control of the strategically vital waterway.

Iranian officials said U.S. strikes have killed dozens of people and wounded hundreds more, with additional casualties reported after Friday's attacks.

The conflict began Feb. 28, when the United States and Israel launched military operations against Iran.