The attacks struck in quick succession while the cafes were filled with customers watching a football match.
Iraqi police say five people were killed in Baghdad's largely Sunni neighbourhood of Azamiyah, and another three were killed in Shiite-dominated Umm al-Maalif, in the south-western suburbs of the capital.
Another blast struck the Shiite town of Jbala, about 35 kilometres south of Baghdad, killing eight.
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