Four Shiite pilgrims were killed and 18 others were injured Friday in roadside bomb attacks in Baghdad, an Iraqi official said.
The serious attack took place near the Shiite-dominated district Sadar City in the morning. Three people were killed and eight others were wounded when a mini-bus was hit through by a roadside bomb.
Separately, one pilgrim was killed and five others wounded in Sadar City in a twin roadside bomb attack.
Five pilgrims were also wounded in a roadside bomb explosion near Shaab stadium in southeastern Baghdad.
According to the Iraqi official, all the victims are Shiite pilgrims coming back from Karbala after taking part in a religious ritual.
Tens of thousands of Shiite pilgrims across the country congregated to the holy city Karbala in recent days to celebrate the mid-Shaaban visit, which falls on Friday. Shaaban is the eighth month of the Islamic calendar and the month precedes the holy month of Ramadan.
Sporadic attacks continue in Baghdad and other Iraqi cities and towns after U.S. combat forces pullout despite low level of violence comparing with the previous years.