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The son of Iran's supreme leader, Ayatollah Ali Khamenei, has taken control of the militia being used to crush the protest movement, according to a senior Iranian source.

The source, a politician with strong connections to the security apparatus, said that the leading role being played by Mojtaba Khamenei had dismayed many of the country's senior clerics, conservative politicians and Revolutionary Guard generals.

But these conservatives are reluctant to challenge the Khameneis openly out of fear that any conflict would destabilise the Islamic Republic and weaken Iran in the region. Instead they will use their positions in the organs of state to make it hard for the supreme leader and President Mahmoud Ahmadinejad to govern.

"This game has not finished. The game has only just started," the source said, on condition of anonymity because of the sensitivity of his own position in Iran.