Iran live updates: US blockade of Iran's Strait of Hormuz ports to begin Monday

Iran's Deputy Minister of Sports and Youth Alireza Rahimi invited people to form human chains around the country's power plants in a video message published on Monday, according to the government's Telegram channel.

Rahimi called on young people, artists, athletes, students and professors to join the initiative -- which he described as a "symbolic move" -- on Tuesday at 2 p.m. local time (6:30 a.m. ET), regardless of their political views, to protect infrastructure he referred to as "national assets that belong to the future of Iran and its young people."

The invitation came as President Donald Trump's Tuesday evening deadline for Iran to fully re-open the Strait of Hormuz approached. Trump has threatened to destroy Iranian civilian infrastructure -- including power plants and bridges -- if Tehran does not comply.

Israeli attacks on Iranian infrastructure, meanwhile, have intensified across the country.

The Israel Defense Forces' Farsi language X account on Tuesday morning issued a warning to all Iranians to "refrain from using and traveling by train throughout Iran" until 9 p.m. local time.

"Your presence on trains and near railway lines endangers your life," the post said.

The Islamic Revolutionary Guard Corps called President Donald Trump's threats to destroy all of Iran's bridges and power plants if a deal to reopen the Strait of Hormuz isn't reached "baseless" and vowed to continue their operations.

"The rude rhetoric, arrogance and baseless threats of the delusional U.S. president, arising from the deadlock he faces and aimed at justifying the repeated defeats of the U.S. military, will have no effect on the continuation of offensive and crushing operations by the fighters of Islam against U.S. and Israeli enemies, and will not repair the humiliation of the United States in West Asia," IRGC spokesperson Ebrahim Zolfaqari said in a statement published in Iranian state media.

President Donald Trump is threatening to destroy all of Iran's bridges and power plants in a four-hour blitz attack on Tuesday night if the countries don't agree to a deal to reopen the Strait of Hormuz by 8 p.m. ET.

"We have a plan because of the power of our military, where every bridge in Iran will be decimated by 12:00 tomorrow night, where every power plant in Iran will be out of business, burning, exploding, and never to be used again," Trump said. "I mean, complete demolition by 12:00, and it will happen over a period of four hours if we want it to. We don't want that to happen."

The president stressed that any deal must include reopening the Strait of Hormuz, saying, "We have to have a deal that's acceptable to me, and part of that deal is going to be we want free traffic of oil and everything else."

He wouldn't discuss specifics of ceasefire negotiations but said, "we have a active, willing participant on the other side."

Trump has sent mixed messages for weeks, saying the war with Iran is winding down while also threatening more attacks. Asked which one it is, Trump replied, "I can't tell you. I don't know."

"Depends what they do," Trump said, before repeating his threat to send Iran back to the "stone ages."