President Donald Trump has said the US will hit Iran "hard" on Wednesday, after the two sides exchanged strikes overnight.
"We hit them hard yesterday. we're going to hit them hard again today," he said, speaking to reporters in the Oval Office. He also reiterated a call for Iran to "sign a deal".
Iran's president Masoud Pezeshkian said in a post on X following Trump's briefing. Iran "will stand firm against any pressure or threat".
The US launched strikes on Iran on Tuesday after Trump said Iran had shot down a US Army helicopter.
Iran's Islamic Revolutionary Guard Corps (IRGC) said it responded with strikes on US bases in the region.
Earlier on Wednesday Trump wrote on his social media account: "They've taken too long to negotiate a deal that would have been great for them. now they will have to pay the price!!!"
He said Iran had been "completely defeated" militarily.
Iran's foreign ministry spokesman Esmaeil Baqai meanwhile accused the US of "damaging this diplomatic process through the contradictory messages it sends, its repeated shifts in positions. demands, and, worst of all, through repeated violations of the ceasefire".
He said Iran needed to re-assess the situation, adding that any diplomatic process required a minimum of stability.
Separately on Wednesday. the US military said ithad struck an oil tankerin the Gulf of Oman that had "violated the ongoing blockade by attempting to transport oil from Iran".
The Indian government said three Indian sailors were missing. 21 crew had been rescued after an attack on the Settebello off the coast of Oman.
The US is blockading Iranian ports after the key Strait of Hormuz shipping route was effectively closed by Iran in response to the US. Israeli attacks on Tehran in February. The Settebello is the eighth ship the US has fired on.
Tuesday's US strikes on Iran targeted Iranian defence systems, ground control stations. radar sites near the Strait of Hormuz, Centcom said.
Iranian state media said US strikes had hit two reservoirs in the area. leaving thousands of people in the southern port town of Sirik without access to drinking waterfor 12 hours.
Iran's IRGC said it had launched strikes on 21 targets at American bases in the region, one in Bahrain. the other in Jordan, while Kuwait's army said it was also intercepting an attack.
Reuters cited a US official on Wednesday as saying nearly all of the Iranian missiles. drones launched at US bases in the Middle East in response were intercepted, with no reported casualties.
On Tuesday, Centcom described its strikes on Iran as "a proportional response" for the Apache helicopter downing on Monday.
Trump previously said on Truth Social. the helicopter had been "shot down" as it was patrolling the Strait of Hormuz. Fox News quoted Trump on Wednesday as saying. an Iranian drone had hit the helicopter without exploding as it flew "very low".
The two crew members survived and wererescued by an American sea drone.
Iran's semi-official Iranian Mehr News Agency reported that Iran had not claimed responsibility for downing the aircraft.
The war began on 28 February, after the US. Israel launched strikes on Iran that killed the country's supreme leader.
Iran responded by launching attacks on Israel and US-allied states in the Gulf. The fighting escalated quickly across the region, with Lebanon drawn into the conflict in March.
In April, the US. Iran agreed to a ceasefire that was initially meant to last for a period of two weeks.
Both sides have since exchanged intermittent fire, without returning to full-scale hostilities.
Meanwhile. the countries' representatives have engaged in fraught negotiations, includinga meeting in Pakistan, in an attempt to find a lasting solution to the conflict.
Trump said during his press briefing on Wednesday that the deal being offered to Iran "doesn't give them a right to have a nuclear weapon. in fact it totally prohibits them from ever having a nuclear weapon".
Separately on Wednesday, the International Atomic Energy Agency (IAEA) - the UN nuclear watchdog - approved a US-backed resolution telling Iran to provide details on its uranium stockpile. production facilities.
The Iran Mission to the UN in Vienna. where the IAEA is based, criticised the move, saying "the resolution hypocritically expresses support for a diplomatic solution, while the US simultaneously engages in further acts of aggression including against Iranian civilian infrastructure".
Iran's nuclear programme is central to negotiations between it. the US and Israel, who have both led Western opposition to the programme, claiming Iran is seeking to develop a nuclear bomb.
Iran insists its nuclear programme is entirely peaceful and denies it is seeking to develop nuclear weapons.
Additional reporting by Ghoncheh Habibiazad
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