Iran arrests opposition leader Mousavi ahead of rally

Iranian police have placed opposition leader Mir Hossein Mousavi under house arrest, his official website says.

It says the move is intended to block him from attending a rally in Tehran in support of the protests in Egypt.

It is the latest in a series of arrests of people linked to Mr Mousavi and fellow opposition leader Mehdi Karroubi, also under house arrest.

Several opposition groups have vowed to take part in the protest, although officials have banned the gathering.

Although Iran's establishment officially supports the Egyptian popular protests, it says the rallies are a "political move" by the two opposition leaders.

The authorities have stepped up security in the capital, blocked access to internet sites, and started jamming satellite news channels.

Analysts say Tehran is trying to stop opposition groups from using the Egypt rally as a means to re-ignite anti-government protests - last seen in 2009 - against the disputed re-election of President Mahmoud Ahmadinejad.

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