A bomb blast killed seven people at a Shiite Muslim mosque in eastern Baghdad on Friday and wounded more than 20, police sources said.
The explosion took place in the Baladiyat neighborhood.
A senior police source said that either a suicide belt or improvised explosive device had been used in the attack, for which there was no immediate claim of responsibility.
The source said the death toll was expected to rise with many of those wounded in serious condition.
Baghdad’s security improved significantly with the defeat of ISIS extremist group in 2017 and bomb attacks of any kind in the city have been rare since then.