Iran-US tensions highlights: The Supreme Leader has moved into a fortified underground shelter in Tehran amid heightened fears of a possible US military strike, Iran International reported.

Trump says US ‘armada’ is heading towards the Gulf, raising fears of a military escalation in the region.

By Michelle Nichols Jan 23 (Reuters) - Iran will treat any attack "as an all-out war against us," a senior Iranian official said on Friday, ahead of the arrival of a U.S. military aircraft carrier strike group and other assets in the Middle East in the coming days.

Tensions between the US and Iran escalated as President Trump deployed an aircraft carrier group toward Iran, while Tehran warned any attack would be treated as “all-out war,” amid ongoing unrest and disputed executions of protesters.

USS Abraham Lincoln heads to Middle East amid Iran tensions.

Amid the brewing tensions between Iran and the United States, the Iranian authorities unveiled a new billboard in central Tehran Square on Sunday, threatening America against any form of intervention.

Iran’s foreign minister warned the U.S. of a forceful response to any attack as military assets move closer to the Middle East.

Emerging on Tuesday (double checking the day…this is Tuesday, two days ago?) from a late-night Situation Room meeting to discuss options for striking Iran, some of President Donald Trump’s top national security officials were relatively sure a decision on military action was at close hand.

Iranian authorities unveiled a new mural on a giant billboard in a central Tehran square Sunday with a direct warning to the United States to not attempt a military strike on the country, as U.S. warships head to the region.