The powerful explosion on Istanbul's Sultanahmet Square has killed least 10 people and injured at least 15 people.
The reasons for the explosion are still unknown, the local media report.
The police and doctors are working on the scene. The police have strengthened the security measures in the city center.
No terrorist organization has claimed responsibility for the blast so far.
As a reminder, dozens of people were killed as a result of two powerful explosions in Ankara in October.
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