While it's not the first time Iran's government has disconnected the internet to stem protests, the current shutdown is "arguably the largest such event" in the country's history, according to Doug Madory, director of internet analysis at Oracle's Internet Intelligence program.
Despite the government saying yesterday that things were "calmer" despite "some minor issues", some eyewitness accounts report ongoing protests in some cities.
On Monday, the powerful Revolutionary Guards warned of "decisive" action if the protests went on.
It voiced concern about the security forces' use of live ammunition and urged authorities to rein in its use of force to disperse protests.
The foreign ministry also criticised the U.S. for expressing support for the protesters.
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"The frequency and persistence of lethal force used against peaceful protesters in these and previous mass protests, as well as the systematic impunity for security forces who kill protesters, raise serious fears that the intentional lethal use of firearms to crush protests has become a matter of state policy".
Iran's economy has been battered since May previous year when the United States unilaterally withdrew from a 2015 nuclear agreement and reimposed crippling sanctions.
Pompeo said that the United States supported the demonstrations that erupted in several cities across the country Friday after Iran's National Oil Company (NIOPDC) announced increases of 50% to 300% in gas prices.
Over the weekend, protests have rocked Iran after a steep hike in fuel prices ignited public anger.
However, the decision was met with widespread anger in a country where the economy is already reeling as a result of USA sanctions that have caused oil exports to collapse and the value of the rial to plummet, and sent the inflation rate soaring.
Mr Colville also called on the Iranian government to respect the rights to freedom of expression and peaceful assembly, and to immediately re-establish Iranians' access to the internet.
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The Judiciary issued sharp warnings about those known to be sending videos of protests overseas.
Notably, Iran imposed an nearly complete nationwide internet blackout on Sunday, making one of its most draconian attempts to cut off Iranians from each other and the rest of the world as widespread anti-government unrest roiled the streets of Tehran and other cities for a third day.
By Sunday, the protests had reached some 100 cities and towns, the semi-official Fars news agency said.
Unverified social media footage showed protesters burning images of senior officials and calling on clerical rulers to step down, as well as clashes between security forces and protesters.
But its spokesman Rupert Colville cautioned that casualty details were hard to verify, in part because of a three-day-old internet shutdown. The statement suggested that if security services decide to heavily confront any protests, the services will likely claim that the remaining protesters are from armed groups hostile to the government rather than ordinary citizens. Media coverage focused on security troops killed by the "rioters", including three who were allegedly stabbed to death in Tehran.
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