Amnesty International says it fears a violent crackdown in Iran which may cause widespread lose of life. The human rights group issued the statement following a speech by Iran’s Supreme Leader, Ayatollah Khamenei, on Friday morning.

“We are extremely disturbed at statements made by Ayatollah Khamenei which seem to give the green light to security forces to violently handle protesters exercising their right to demonstrate and express their views,” says Amnesty's Hassiba Hadj Sahraoui, Deputy Director of the group's Middle East and North Africa Programme.

“If large numbers of people take to the street in protests in the next couple of days, we fear that they will face arbitrary arrest and excessive use of force, as has happened in recent days, particularly as permission for a demonstration to be held in Tehran on Saturday 20 June has been denied.”

In a televised address to the nation during Friday prayers in Tehran, Ayatollah Khamenei called for an end to street protests against the outcome of the election.

Instead of warning security forces, including the volunteer Basij militia, to act with restraint and in accordance with the law, he said that if people continued to take to the streets, the consequences would lie with them.

“For a head of state to put the onus of security on peaceful demonstrators and not on the security forces is a gross dereliction of duty and a license for abuse,” said Hassiba Hadj Sahraoui.

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Ayatollah Khamenei's speech on Friday was his first public reaction since demonstrations against the disputed presidential election result began six days ago. He addressed thousands of people at Tehran University and surrounding area, who were gathering for Friday prayers.

He said the leaders of any further protests would be held responsible if there was further bloodshed. Ayatollah Khamenei told the crowds that the election result "comes from the ballot box, not from the street". The cleric voiced his support for President Mahmoud Ahmadinejad, saying the president's views on foreign and social affairs were close to his own.

Supporters of opposition leader Mir Hossein Mousavi are accusing the president of electoral fraud and large scale vote-rigging. Mr Mousavi has called for annulment of the election result, which showed President Ahmadinejad the winner with nearly 63 percent of the vote. The country has not seen street demonstrations of this scale since the Iranian revolution of 1979 in which the monarchy was overthrown.

Amnesty says it is calling on Iran to allow peaceful assembly which is expressly permitted under the International Covenant on Civil and Political Rights to which Iran is a state party. The covenant says law enforcement officials must use force only when strictly necessary and to the extent required for the performance of their duty and that they must not use firearms unless strictly unavoidable and in order to protect life. Law enforcement personnel must exercise restraint, minimize damage or injury and respect and preserve human life, says the human rights group.