Huge anti-government protests are reported in Tehran and other Iranian cities.

Videos verified by BBC Persian show large crowds in Tehran and Mashhad, and rights groups report dozens of deaths and thousands of arrests during a 12-day wave of protests.

Videos on social media show large crowds of protesters marching in Tehran and other Iranian cities, including Mashhad. BBC Persian has verified footage of rallies that, in some instances, were not dispersed by security forces. The demonstrations began on 28 December amid a sharp fall in the rial and rising inflation. Rights groups report the unrest has continued for 12 days and spread across many parts of the country. Known details: - BBC Persian verified footage shows large rallies in Tehran and Mashhad that were not immediately dispersed. - Human rights groups and monitoring agencies report the protests have spread to many cities and provinces during a 12-day period. - Rights groups have reported dozens of people killed and thousands arrested, while Iranian authorities have reported some deaths among security personnel. - The demonstrations were reported to have begun after a steep fall in the value of the rial and rising inflation. Summary: The reports indicate large-scale demonstrations that began in late December and have spread widely, with differing tallies of casualties and arrests reported by rights groups and state sources. Undetermined at this time.