Tehran’s response to Trump’s threat signals a potentially dangerous escalation as both sides menace sites relied on by millions

Middle East crisis live – latest updates

Tehran has said it will “irreversibly destroy” essential infrastructure across the Middle East, including vital water systems, if the US follows through on Donald Trump’s threat to “obliterate” Iran’s power plants unless the strait of Hormuz is fully opened within two days.

As Iranian missiles struck two southern Israeli cities overnight, injuring dozens of people, and Tehran deployed long-range missiles for the first time, the developments signalled a dangerous potential escalation of the war, now in its fourth week, with both sides threatening facilities relied on by millions of people.

The speaker of the Iranian parliament, Mohammad Bagher Ghalibaf, said on Sunday that vital infrastructure in the region – including energy and desalination facilities – would be considered a legitimate target and would be “irreversibly destroyed” if his country’s own infrastructure was attacked.