Iraqi security forces and U.S. troops imposed stiff security across Baghdad on Thursday as hundreds of thousands of Shiite faithful made their annual trek to the shrine of a fabled and beloved imam.
So far, there have been no reports of sectarian or insurgent violence, but there was one accident -- sparks on a Baghdad train carrying pilgrims left one dead and seven injured, according to the Iraqi Interior Ministry.
Marchers beating their chests and dancing in circles in the traditional Shiite fashion trod toward the Kadhimiya shrine to commemorate the death of eighth-century imam Musa al-Kadhim, the seventh of the 12 early imams revered by the Shiites. Watch throngs pack the streets of Baghdad 
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CNN's Mohammed Tawfeeq in Baghdad and Joe Sterling in Atlanta contributed to this report.
All About Islam • Shia Islam • Iraq