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Iranians commemorate martyrdom of prophet's grandson

Vahid Salemi / AP

A crowd gathers to commemorate Arbaeen in Tehran, Iran, on Jan. 3, 2012.

Crowds gathered in Tehran on Thursday for a ceremony commemorating Arbaeen, the final day of the annual 40-day mourning period for the seventh century martyrdom of Imam Hussein, the grandson of Prophet Muhammad.

--  The Associated Press

Behrouz Mehri / AFP - Getty Images

A Shiite Muslim man beats his chest at Tehran's Grand Bazaar on Jan. 3, 2013 during the Arbaeen religious festival which marks the 40th day after Ashura.

Vahid Salemi / AP

Mourners beat their chests in a ceremony commemorating Arbaeen in Tehran on Jan. 3, 2012.