The sources said the attack was carried out at a religious endowment headquarters in the Baab al-Muadham neighborhood of Baghdad at 11:00 a.m. local time (0800 GMT) on Monday.
Two policemen were among the victims.
The latest bombing in Baghdad comes a few days after 17 people were killed in a series of bomb attacks in the capital on May 31.
On April 19, Iraqi security officials said at least 34 people were killed and dozens of others injured in bomb and shooting attacks carried out in six different regions across the country.
HSN/HJL
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