At least 10 people have been killed in an explosion at central Istanbul's historic Sultanahmet square, a major tourist attraction, the city governor's office said.
The explosion occurred at about 10.20am local time on Tuesday morning.
In a statement, the Istanbul governor's office said 10 people were killed and 15 were injured.
"Investigations into the cause of the explosion, the type of explosion and perpetrator or perpetrators are underway," it said in a statement quoted by the Dogan news agency.
Foreign tourists are believed to be among the casualties.
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