A spokesperson for Iran's Khatam al-Anbiya Central Headquarters warned Thursday that Tehran would unleash widespread military attacks across the region if the United States strikes the country's key infrastructure.

"If the recent threats by the empty-headed U.S. president to target the infrastructure of the Islamic Republic of Iran are carried out, then everything that, out of Iran's restraint, has so far remained intact — namely all infrastructure in the region — will be crushed under the powerful blows of Iran's armed forces," the spokesman, Ebrahim Zolfaghari, said in a statement.

Zolfaghari also said Iran would not allow the U.S. to intervene in the Strait of Hormuz "under any circumstances," calling it "Iran's invincible red line."

Earlier this week, President Donald Trump threatened to expand military strikes and continue hitting Iran "very hard" unless it returns to the negotiating table.

"Next week it gets really bad for them because next week comes the power plants," Trump said Tuesday in an interview with Fox News chief foreign correspondent Trey Yingst.

"Next week comes the bridges. We're gonna knock out all their power plants. We're going to knock out all their bridges unless they get to the table and negotiate."