By Jana Choukeir and Eman Abouhassira

DUBAI, July 17 (Reuters) - The United States struck bridges and an airport in Iran on Friday and Tehran responded by hitting a power and desalination plant in Kuwait, as the warring foes risked further escalation by expanding their targets to include infrastructure.

In the contested Strait of Hormuz, where the renewed conflict has again cut off global energy supplies from the Middle East, U.S. Marines boarded a tanker and another ship was reported to have been hit by a projectile.