The successful protests that toppled President Hosni Mubarak's regime in Egypt have inspired Iranians to take to the streets once again.
But Iran's harsh Islamic Republic has already begun cracking down. They have cut telephone lines and placed opposition leaders under house arrest to stop them from attending Monday's rally.
Kaleme.com, an Iranian reformist website, said police stationed several cars in front of the home of Mir Hossein Mousavi ahead of the demonstration called for later Monday in central Tehran. Mousavi and fellow opposition leader Mahdi Karroubi have been under house arrest since last week.
Iranian authorities have poured police and militiamen onto the streets of Tehran to challenge any pro-Egypt marches, which officials worry could turn into demonstrations against Iran's ruling system.
However, opposition supporters revived a tactic from the unrest, shouting "Allahu Akbar," or God is Great, from rooftops and balconies into the early hours Monday in a sign of defiance toward Iran's leadership.
Over the weekend, the U.S. called on Iran "to allow people to enjoy same universal rights to peacefully assemble, demonstrate as in Cairo."
Iran brutally crushed massive protests back in 2009, following the country's disputed election.
Ironically, 32 years ago on Feb. 11, 1979, Iranians took to the streets in celebration as the Shah was ousted. A forgotten exiled cleric by the name of Ruhollah Khomeini and his followers rose to power, changing Iran into an Islamic state.