First Confirmed Video from 25 Bahman

Video was captioned with the following on Mousavi's Facebook:

In response to the call by Mir Hossein Mousavi and Mehdi Karroubi to hold public demonstrations in solidarity with the popular uprisings in Egypt and Tunisia against dictatorship, today (Feb 14, 2011) great number of people took to the streets despite heavy security presence and reported clashes and chanted “Down with the... dictator”. Both Mir Hossein Mousavi and Mehdi Karroubi have been under house arrest and all of their communication channels have been disconnected by government at this time.