In the deadliest incident, a suicide bomber killed 11 people, including Iraqi army soldiers, at an army and police checkpoint in the capital.
Others were killed by bombing and mortar attacks on two markets in Baghdad.
On June 16, 11 people were killed in in a Shi'ite mosque in the capital.
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SUNNI, SHI'A: Iraq is riven along sectarian lines, faults that frequently produce violent clashes and are a constant source of tension. Sectarian concerns drive much of Iraqi politics and are the main threat to the country's fragile security environment.