According to the Alsumaria broadcaster, the blast hit a restaurant north of the city of Tikrit.
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Earlier in the day, Reuters reported, citing police, that a suicide bomber had detonated a car that had been rigged to explode. The incident took place at a restaurant not far from the Iraqi city of Tikrit.
No terrorist group has announced that it was behind the deadly attack, however Daesh* is frequently involved in similar attacks.
*Daesh (also known as ISIS/ISIL/IS) is a terrorist organization banned in Russia and many other countries.