Gunfire has been heard around Turkey's iconic Dolmabahce Palace in Istanbul, a major tourist attraction, reports say.
One witness said she heard a blast, then shooting. Two armed people are being sought in connection with the attack, and one report said they were detained at the scene.
Ambulances have been sent to the area and the roads have been sealed off by police, media reports say.
There have been no reports of casualties so far.
The Dolmabahce Palace was the main administrative centre of the Ottoman Empire for many years in the 19th and early 20th centuries.
The founder of modern Turkey, Mustapha Kemal Ataturk, died there in 1938.
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