Iran says it is targeting American forces and bases across the region.
President Donald Trump announced "major combat operations" against Iran on Feb. 28, with massive joint U.S.-Israeli strikes targeting military, government and infrastructure sites.
Delegations from the U.S. and Iran entered negotiations in June aimed at a war-ending deal based on a memorandum of understanding signed by both countries.
The U.S. and Iran have nonetheless continued to exchange strikes, with the strategic Strait of Hormuz the primary flashpoint.
The UK's Foreign office announced on Wednesday that "due to the security situation," embassy staff have been temporarily withdrawn from Iran.
The embassy will continue to operate remotely, according to the Foreign, Commonwealth and Development Office.
Iranian parliament speaker Mohammad Bagher Ghalibaf said in a post on X that if Iran cannot sell its oil, no one else can sell oil either.
"If our security is not ensured, no infrastructure will be safe, and the security of the strait is in the absence of American forces," he added.
Iran’s military said the U.S. is unable to locate missile production sites and that it continued to manufacture missiles and attack drones throughout the war.
"Missiles are moving directly from production to operational use while replenishing our stockpiles," military spokesperson Abolfazl Shekarchi said, state-run Iranian TV IRIB reported.
The military has manufactured missiles and attack drones throughout all phases of the US-Israel conflict, including when the memorandum of understanding took effect, Shekarchi said, IRIB reported.
"The enemies are confused by all the intelligence gathering tools and do not know where we produce missiles," he said, according to IRIB.
"During the 40 days of war and the breach of promise after the signing of the memorandum, the production of our strategic missiles never stopped. The missiles are replenishing our reserves," he said, according to IRIB.
President Donald Trump is threatening to attack Iran’s critical infrastructure, writing on social media that the U.S. will bomb "ONE BRIDGE OR POWER PLANT" any time Iran "shoots at a ship in the Strait of Hormuz."
Trump made clear that this action would be in retaliation to vessels targeted in the Strait, but he did not mention any repercussions for Iran’s attacks on Gulf allies or U.S. assets in recent days. On Monday, Trump said Iran would "pay" "many times over" for killing American servicemembers, though he has not specified exactly what form such consequences would appear in.
In his post Wednesday morning, Trump’s threat included bridges and power plants near or in the highly-populated city of Tehran.
"From this point forward, any time the Islamic Republic of Iran shoots at a ship in the Strait of Hormuz, whether it be by Missile, Rocket, Drone, or any other device or weapon, the United States will bomb and destroy ONE BRIDGE OR POWER PLANT, including those located next to, or in, the Capital City of Tehran," he wrote.
