TEHRAN, Iran -- Two protesters taking part in demonstrations roiling Iran were killed at a rally overnight, authorities said Sunday, the first deaths attributed to the ongoing protests as the government blocked access to a popular messaging app used by activists.
The demonstrations, which began Thursday over the economic woes plaguing Iran, appear to be the largest to strike the Islamic Republic since the protests that followed the country's disputed 2009 presidential election.
They were fanned in part by messages sent on the Telegram messaging app, which authorities blocked Sunday along with Instagram.
In Doroud, a city some 325 kilometers (200 miles) southwest of Tehran in Iran's western Lorestan province, protesters gathered for an unauthorized rally that lasted into the night Saturday, said Habibollah Khojastepour, the security deputy of Lorestan's governor. The two protesters were killed in clashes at the rally, he said.
"The gathering was to be ended peacefully, but due to the presence of the (agitators), unfortunately, this happened," Khojastepour said.
He did not offer a cause of death for the two protesters, but said "no bullets were shot from police and security forces at the people."
Videos circulating on social media late Saturday appeared to show fallen protesters in Doroud as gunshots sounded in the background. The Associated Press could not immediately verify the footage.
Thousands have taken to the streets of cities across Iran, beginning on Thursday in Mashhad, the country's second-largest city and a holy site for Shiite pilgrims.
The protests in the Iranian capital, as well as President Donald Trump tweeting about them, raised the stakes. It also apparently forced state television to break its silence on Saturday, acknowledging it hadn't reported on the protests on orders from security officials.
At least 50 protesters have been arrested since Thursday, authorities said Saturday. State TV said some protesters chanted the name of the U.S.-backed shah, who fled into exile just before Iran's 1979 Islamic Revolution and later died.
On Sunday, the semi-official ILNA news agency reported that authorities have arrested some 80 protesters in the city of Arak, some 280 kilometers (173 miles) south of Tehran.
While the protests have sparked clashes, Iran's hard-line paramilitary Revolutionary Guard and its affiliates have not intervened as they have in other unauthorized demonstrations since the 2009 election.
Many in Iran are learning about the protests and sharing images of them through Telegram, a mobile phone messaging app popular among the country's 80 million people. On Saturday, Telegram shut down one channel on the service over Iranian allegations it encouraged violence, something its moderator denied.
On Sunday, Telegram CEO Pavel Durov wrote on Twitter that authorities had blocked access to the app.
"Iranian authorities are blocking access to Telegram for the majority of Iranians after our public refusal to shut down ... peacefully protesting channels," he wrote.
Iran's state TV news website, iribnews.ir, quoted an anonymous source saying that social media in Iran would be temporarily limited as a safety measure.
"With a decision by the Supreme National Security Council, activities of Telegram and Instagram are temporarily limited," the report said, without elaborating.
Gambrell reported from Dubai, United Arab Emirates.
This article was written by Jon Gambrell and Amir Vahdat from The Associated Press and was legally licensed through the NewsCred publisher network. Please direct all licensing questions to firstname.lastname@example.org.