India, July 17 -- The United States expanded its airstrike campaign against Iran early on Friday by hitting more bridges, electrical equipment and collapsing a tower at a key Iranian port, part of US President Donald Trump's threats to start striking infrastructure to pressure Tehran to ease its chokehold on the Strait of Hormuz.

The US airstrikes hit bridges overnight into Friday in Iran's southern Hormozgan province, killing at least seven people, Iranian state television reported. The attacks hit Bandar Khamir, a city on Iran's coast on the Strait of Hormuz.

The highway and railway bridge strikes appeared aimed at cutting off Bandar Abbas, Iran's main port, from roads leading into the Islamic Republic's central region onward to Tehra...