A bomb explosion struck Shiite pilgrims in central Baghdad on Thursday, wounding eight worshippers who were heading to the capital's northern holy neighborhood of Kadhimiya to commemorate the death of a Shiite Imam, an Interior Ministry source said. The attack took place in the morning near the Talaie Square in Hifa Street, while crowds of Shiite pilgrims were travelling on foot on their way to the tomb of Imam Musa al-Kadhim in northern Baghdad, the source said on condition of anonymity. Hundreds of thousands of Shiite pilgrims converge every year from Iraqi cities and Shiite Muslim countries, particularly Iran, on the mausoleum of Imam Musa al-Kadhim, to mark the death of the seventh of the twelve Shiite Imams. The Shiite pilgrimage will reach a climax on Saturday. Kadhim's burial site is in the golden-domed mosque in center of the old part of the Kadhimiya district. 