Police Brigadier General Sabah al-Hamidi says 26 people were wounded by the explosion.
Tal Afar is about 420 kilometers northwest of Baghdad. Police said suicide attackers apparently were involved.
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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.