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TEHRAN, Iran (CNN) -- Clashes erupted as two of Iran's main opposition leaders tried to join the several thousand people at a memorial for the slain woman who became the symbol of Iran's post-election violence, witnesses said.

Security forces barred opposition leaders Mir Hossein Moussavi and Mehdi Karrubi from the grave site of Neda Agha-Soltan, the 26-year-old woman shot in election protests on June 20, witnesses and news reports said. About 2,000 to 3,000 people were gathered at Agha-Soltan's grave, Iran's Press TV reported.

Mourners arrived on the religiously significant 40th day after the fatal shooting in Tehran. For Iranians, a predominantly Shiite Muslim population, the 40th day after a death marks the last official day of mourning.

Security forces worked to clear the area of demonstrators and mourners. A witness said riot police and Basij militia were there, but confrontations with people in the crowd involved the militia.