It is hard to gauge opinion in Iran, but one of the protesters' wishes seems to be better relations with the outside world.

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Police have not been given permission to use firearms in confronting protesters, Tehran Police Chief Azizollah Rajabpour told Iran's semi-official Mehr news agency.

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On a visit to Germany, Iran's president, Muhammad Khatami, was greeted by thousands of protesters, urging faster reform.

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Iran said it regretted the incident, which it described as "unacceptable behaviour by a small number of protesters".

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