The United States expanded its airstrike campaign against Iran early Friday by hitting more bridges and apparently collapsing a tower at a key Iranian port, part of U.S. President Donald Trump’s threats to start striking infrastructure to pressure Tehran to ease its chokehold on the Strait of Hormuz. Iran launched new missile attacks against U.S.-allied nations in the Middle East, including Qatar, a key mediator in the war. The interim ceasefire agreed to last month has collapsed.