Mobile phone footage filmed in the Iranian capital, Tehran, appears to show the scene at a cemetery where people had gathered to remember Neda Agha Soltan, a young woman who was killed during post-election protests last month.
Reports say police used batons and some mourners threw stones. A number of people are known to have been arrested.
Witnesses at the commemoration said one of the main opposition leaders, Mir-Hossein Mousavi, was among those attending.
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