Iran has eased some restrictions and is allowing people to make international calls via mobile phones. Internet access and texting services remained blocked Tuesday.

President Trump is meeting with top national security advisers on Tuesday to consider action against Iran over its crackdown on protesters.

Iran is reportedly set to execute its first protester linked to mass arrests over the widespread anti-regime demonstrations. More than 500 people were also killed in the crackdown.

President Donald Trump has warned he is weighing up "strong options" in response to Regime's crackdown on protests.

At least 572 people have been killed as security forces try to quash the unrest, activists say, with the true scale of the crackdown yet to become clear amid an internet blackout.

Trump is not ruling out a military strike of Iran,, but experts say he is unlikely to give a full push for regime change. Here's

Oil prices extended gains on Tuesday as heightened concerns surrounding Iran and potential supply disruptions outweighed the prospect of increased crude supply from Venezuela.

In an interview with CBS News' Norah O'Donnell on Monday, Iran's exiled Crown Prince Reza Pahlavi said, "We need action to be taken."

Protests over recent days have continued as the US threatens military action over Iran's treatment of protestors.

U.S. President Donald Trump on Monday said any country that does business with Iran will face a 25% tariff on trade with the U.S., as Tehran grapples with its most substantial anti-government protests in years.