These latest strikes come after the two sides exchanged fire for the first time in a month over the weekend.
The US military said it had struck rocket launchers on Larak Island in the strait of Hormuz on Sunday, in its first strikes on Iran since July, after it detected the Iranians were planning to deploy fresh mines in the critical waterway.
Tehran responded by launching missiles at US sites in Jordan, which were intercepted, and the United Arab Emirates, which said it had stopped an Iranian drone over its territorial waters.
US president Donald Trump threatened further action on Monday, telling Fox News: “We’re going to hit them hard. There will be a response.”
The US is trying to prise open Tehran’s grip on shipping going through the strait of Hormuz, which before the war accounted for a fifth of the world’s seaborne energy supply. Washington claimed that Iranian control over the waterway had been loosened by repeated US attacks on Iranian missile launchers and radars.
Last week Trump claimed the US navy had cleared the strait of mines for the first time since the conflict started on 28 February, a claim the Iranians rejected as lies.
Iranian state TV claimed the military exchanges escalated on Sunday after a tanker caught fire when hitting two Iranian naval mines while attempting to pass through the southern side of the strait close to Oman. Officials later said Iran had targeted three ships trying to navigate the southern route that Tehran says is unauthorised.
The Islamic Revolutionary Guard Corps (IRGC) warned that other ships violating its rules would face the same fate and said compliance with its regulations for passage through the strait was mandatory.
Here’s our report on that from Monday:
Trump threatens further action as US and Iran exchange fire in new flare-upRead more