Watch: Buildings in Tehran set on fire as demonstrations spread across Iran

Footage verified by BBC Persian shows buildings on fire in the Iranian capital, Tehran, as anti-government protests spread across the country.

Video from the the 12th consecutive day of national unrest shows mosques in the Gholhak and Sa'adat Abad neighbourhoods of Tehran on fire.

Frustration over the collapse of Iran's currency has triggered demonstrations in more than 100 cities and towns across all 31 of Iran's provinces, according to human rights groups.