Is Mousavi under house arrest?

Not exactly sure where he is...

Protesters set fires and smashed store windows Sunday in a second day of violence as groups challenging President Mahmoud Ahmadinejad's re-election tried to keep pressure on authorities that have responded with anti-riot squads and blackouts of web networks used to rally the pro-reform campaign.

Ahmadinejad dismissed the unrest - the worst in the decade in Tehran - as 'not important' and insisted the results showing his landslide victory on Friday were fair and legitimate even though his rival said he would appeal the result. A huge rally in his support was organised even as clashes flared around the capital.

The violence spilling from the disputed results has pushed Iran's Islamic establishment to respond with sweeping measures that include deploying anti-riot squads around the capital and cutting mobile phone messaging and internet sites used by the campaign of Ahmadinejad's election rival, Mir Hossein Mousavi.

His whereabouts are not known and he has not been seen publicly since a news conference shortly after polls closed. His own website has been shut down. More than 100 reformists were arrested last night after Ahmadinejad's election victory led to street protests.