Mobile phone services across Iran have been severely disrupted following the country’s recent internet shutdown. According to Turkey-based TRT World, many regions have been without mobile network access since Friday, January 9. International media reports indicate that the mobile service disruptions began soon after the internet was cut off, though the Iranian government has not issued any official statement on the matter.

The disruptions come amid widespread anti-government protests that began on December 28 over rising living costs. The demonstrations started when traders at Tehran’s Grand Bazaar closed their shops in protest and were later joined by people from various professions. The protests, ongoing for 12 days, intensified on Thursday night as thousands took to the streets in Tehran and other cities.

Human rights organizations report that at least 38 people have been killed during the unrest. Meanwhile, U.S. President Donald Trump has warned that if the Iranian government continues killing protesters, the United States may intervene directly with strong military action.