Iranian Opposition groups called for a new round of street protests to coincide with the inauguration ceremony for President Mahmoud Ahmadinejad on Wednesday.
The pro-reform movement claims the June-12 election declared for Ahmadinejad was fraudulent and opposition leader Mir Hussein Moussavi was the real winner.
Several pro-reform blogs and websites,including some linked to Moussavi,appealed for demonstrators to gather in front of parliament,where Ahmadinejad is to be officially sworn in for a second term. They also called for protests at main markets in other cities around Iran.
Any protests will almost certainly be met by a heavy security presence,as the government has harshly cracked down on any opposition demonstrations over the disputed election.
At least 30 people have died in the unrest that followed the vote.