The incident happened at a popular restaurant near the historic Anadolu Hisar fortress on the Asian side of Istanbul.
Some reports state that the sole attacker has been apprehended.
Preliminary reports say the shooting was not a terrorist act. Some reports claim that the shooter targeted a person who had killed his father a decade ago.
Turkey is still reeling from the mass shooting at the Reina nightclub on New Year's Eve, in which 39 people were killed. The gunman in that attack, allegedly acting on behalf of terrorist organization Islamic State (IS, formerly ISIS/ISIL), was captured two weeks ago.
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