Two mortar bombs struck here in the Iraqi capital on Sunday.<br/> <br />The blasts killed at least six people and wounded 38 when they detonated in the square filled with Shi'ite Muslim pilgrims, according to police and hospital sources.<br/> <br />The attack took place as the pilgrims were gathering ahead of a religious festival in the Kadhimiya district to commemorate the death of 8th century Shi'ite Imam Moussa al-Kadhim.<br/> <br />An Interior Ministry source said security forces have been put on high alert, and that a tight security belt was in place to prevent further attacks on pilgrims.<br/> <br />During the same religious pilgrimage in 2005, about 1,000 people were killed when rumours of a bombing on a bridge triggered a stampede that sent the crowds tumbling into the river below.<br/> <br />Travis Brecher, Reuters