Cars block a street during a protest against a rise in gasoline prices, in the central city of Isfahan, Iran, Saturday, Nov. 16, 2019. Demonstrators angered by a 50% increase in government-set gasoline prices blocked traffic in major cities and occasionally clashed with police Saturday after a night of demonstrations punctuated by gunfire. (AP Photo)

Cars block a street during a protest against a rise in gasoline prices, in the central city of Isfahan, Iran, Saturday, Nov. 16, 2019. Demonstrators angered by a 50% increase in government-set gasoline prices blocked traffic in major cities and occasionally clashed with police Saturday after a night of demonstrations punctuated by gunfire. (AP Photo)

DUBAI, United Arab Emirates (AP) — Protesters angered by Iran raising government-set gasoline prices by 50% blocked traffic in major cities and occasionally clashed with police Saturday after a night of demonstrations punctuated by gunfire, in violence that reportedly killed at least one person.

The protests put renewed pressure on Iran’s government as it struggles to overcome the U.S. sanctions strangling the country after President Donald Trump unilaterally withdrew America from Tehran’s nuclear deal with world powers.

Though largely peaceful, demonstrations devolved into violence in several instances, with online videos purporting to show police officers firing tear gas at protesters and mobs setting fires. While representing a political risk for President Hassan Rouhani ahead of February parliamentary elections, it also shows the widespread anger among Iran’s 80 million people who have seen their savings evaporate amid scarce jobs and the national rial currency’s collapse.

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The demonstrations took place in over a dozen cities in the hours following Rouhani’s decision early Friday to cut gasoline subsidies to fund handouts for Iran’s poor. Gasoline in the country still remains among the cheapest in the world, with the new prices jumping up to a minimum of 15,000 rials per liter of gas — 50% up from the day before. That’s 13 cents a liter, or about 50 cents a gallon. A gallon of regular gasoline in the U.S. costs $2.60 by comparison.

But in a nation where many get by as informal taxi drivers, cheap gasoline is considered a birthright. Iran is home to the world’s fourth-largest crude oil reserves. While expected for months, the decision still caught many by surprise and sparked immediate demonstrations overnight.

Violence broke out Friday night in Sirjan, a city some 800 kilometers (500 miles) southeast of Tehran. The state-run IRNA news agency said “protesters tried to set fire to the oil depot, but they were stopped by police.” It did not elaborate, but online videos circulating on Iranian social media purported to show a fire at the depot as sirens wailed in the background. Another showed a large crowd shouting: “Rouhani, shame on you! Leave the country alone!”

Mohammad Mahmoudabadi, an Interior Ministry official in Sirjan, later told state television that police and demonstrators exchanged gunfire, wounding several. He said many protestors were peaceful, but later masked men armed with guns and knives infiltrated the demonstration.

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“They insisted on reaching the oil depot and creating crises,” Mahmoudabadi said.

The semi-official ISNA news agency later quoted Mahmoudabadi as saying the violence killed one person.

In Iran’s oil-rich Khuzestan province, online videos purported to show police firing tear gas on crowds. The province’s city of Khorramshahr also saw gunfire, as could be heard in a brief clip played on air by state television. The region has long been a political tinderbox, with its ethnic Arab population that feels disenfranchised from the country’s Persian-language majority.

Saturday morning, the start of the Iranian workweek, saw protesters stop cars on major roadways across the capital, Tehran. Peaceful protesters blocked traffic on Tehran’s Imam Ali Highway, calling for police to join them as the season’s first snow fell, according to online videos. A dump truck later dropped bricks on the roadway to cheers.

A large crowd in the city of Kermanshah demonstrated and later drew tear gas fire from police, a video showed. Others reportedly clashed in Tabriz, another major Iranian city. The online videos corresponded to Associated Press reporting on the protest.

Such protests require prior approval from Iran’s Interior Ministry, though authorities routinely allow small-scale demonstrations over economic issues, especially as the country has struggled with currency devaluation. Interior Minister Abdolreza Rahmani Fazli later warned on state TV that authorities would crack down on anyone threatening the nation’s security.

It wasn’t immediately clear if police made arrests. Iranian state television aired a segment Friday night trying to dispute the claims of opposition satellite news channels about the protests, calling their videos of demonstrations “fake news” in English. Demonstrators in many online videos Saturday began identifying the time and place in response.

Iranian internet access meanwhile saw disruptions and outages Friday night into Saturday, according to the group NetBlocks, which monitors worldwide internet access. By Saturday night, “real-time network data show connectivity has fallen to just 7% of ordinary levels following 12 hours of progressive network disconnections as public protests have continued across the country,” NetBlocks said.

“The ongoing disruption is the most severe recorded in Iran since President Rouhani came to power, and the most severe disconnection tracked by NetBlocks in any country in terms of its technical complexity and breadth,” the group said. The websites of state media outlets appeared affected by the outage early Sunday.

Protester chants mirrored many from the late 2017 economic protests, which resulted in nearly 5,000 reported arrests and at least 25 people being killed. Some criticized Iran’s spending abroad on Palestinians and others while the country’s people remain poor. Protests meanwhile continue in Iraq and Lebanon, two Mideast nations home to Iranian proxies and crucial to Tehran’s influence abroad.

Iran long has suffered economic problems since its 1979 Islamic Revolution cut off its decades-long relationship with the U.S. Its eight-year war with Iraq in the 1980s followed, further straining its economy.

The collapse of the nuclear deal has exacerbated those problems. The Iranian rial, which traded at 32,000 to $1 at the time of the accord, fell to 122,600 to $1 in trading Saturday. Iran has since begun breaking terms of the deal as it tries to force Europe to come up with a way to allow it to sell crude oil abroad despite American sanctions.

Henry Rome, an analyst at the Eurasia Group, said that after mass protests, Rouhani was forced to back down from a 2017 plan to increase fuel prices by 50%.

“The government was clearly attuned to this risk: The latest announcement was made in the middle of the night before a weekend,” Rome said. “It took effect immediately, and it was announced without direct consultation with lawmakers.”