Iran's semi-official Fars news agency reports that a man taking part in a protest in the northern province of Alborz was fatally shot.
Iranian authorities have barely mentioned days of protests in the major cities of Isfahan, Shiraz, Mashhad and Tehran, driven by concerns over water, the economy and wider anger at the political system.
The rhetoric between the USA and Iran remains heated, despite Trump tweeting last week that he would be willing to meet with Iranian President Hassan Rouhani.
More than half-a-dozen current and former officials told the Reuters news agency that the campaign is meant to work in concert with US President Donald Trump's push to economically throttle Iran by re-imposing tough sanctions.
But the government of President Hassan Rouhani also faces opposition from conservatives and religious leaders, who have long opposed his outreach to the West and are keen to leverage anger over corruption to unseat him.
In June, the USA state department said that countries buying oil from Iran should bring down to zero their Iranian crude imports by the time Washington re-imposes sanctions on November 4.More news: Turkish minister mocks USA sanctions against him
Repeating the pattern of past weeks, crude prices on Friday ended the week down by 0.4 percent for West Texas Intermediate and 1.5 percent for Brent, this time in reaction to China state oil major Sinopec cutting its purchases of USA product due to the trade spat between both countries.
A second wave of sanctions will be re-imposed in November that target Iran's energy and banking sectors.
Iran Air announced it would take delivery of five ATR aircraft from the French-Italian firm on Sunday, sneaking under the wire before the sanctions return.
The German finance ministry said this week, after Germany's Bild daily reported on the new Bundesbank rules, that the Iranian request is still under consideration - a process that involves Germany's financial market regulator and financial intelligence unit. However, only 13 planes have been delivered since sanctions on Iran were lifted under the nuclear pact.
Some smaller foreign companies have vowed to get around the United States sanctions but large multinational firms such as France's Total and Peugeot, and Germany's Siemens have already announced they'll abide by the sanctions.
People are growing increasingly angry over rising inflation and a dramatic plunge in the currency - the rial - which has lost almost two-thirds of its value in the past six months.