Protesters angered by Iran's cratering economy confronted police officers in front of parliament on Monday, with security forces firing tear gas at them, according to online videos, the first such confrontation after similar demonstrations rocked the country at the start of the year.

The unplanned demonstration came a day after protests forced two major shopping centers for mobile phones and electronics to close in Tehran and after demonstrators earlier closed its Grand Bazaar.

It also signaled widespread unease beneath the surface in Iran in the wake of President Donald Trump's decision to withdraw America from Tehran's nuclear deal with world powers.

It wasn't immediately clear who led the protests. Iran's semi-official news agencies Fars, ISNA and Tasnim described the protests at the Grand Bazaar as erupting after the Iranian rial dropped to 90,000 to the dollar on the country's black market, despite government attempts to control the currency rate.

Videos posted to social media showed protesters at the bazaar heckling shopkeepers who refused to close, shouting in Farsi: "Coward!"