Five people were killed and 20 wounded on Wednesday when a bomb planted in a parked car exploded in southwestern Baghdad, Iraqi police said.
The explosion took place in a bus terminal in the Bayaa neighbourhood, police said, adding that the death toll could rise.
The violence that erupted across Iraq after the 2003 U.S.-led invasion has dropped sharply in the past year, but suicide attacks and car bombs still occur routinely.
Several separate incidents on Wednesday targeted Shi'ite pilgrims marking Arabain, a major religious rite for Shi'ite Muslims.
A roadside bomb in Waziriya in northern Baghdad killed one pilgrim and wounded six others as they made their way on foot toward the southern holy city of Kerbala, police said.
The bomb also wounded six civilians in a minibus.
Another roadside bomb struck Shi'ite pilgrims in southern Baghdad, killing one and wounding five, police said.