(Reuters) – The United States struck bridges in Iran, and Tehran responded by hitting a power and desalination plant in Kuwait on ​Friday, as the two sides risked further escalation by expanding their targets to include infrastructure.

At sea, where the renewed conflict has again cut off energy supplies from the Gulf, U.S. Marines boarded a ‌tanker near the Strait of Hormuz. Armed men seized another vessel off Yemen, raising concern over security in the Middle East’s other big choke point for oil shipments at the mouth of the Red Sea.

Iran’s semi-official Tasnim news agency reported late on Friday that the Revolutionary Guards navy had “targeted” a Thai-flagged ship trying to get through the Strait of Hormuz. It did not give further details.