A helicopter has crashed into a television tower in Istanbul in dense fog, killing at least five people.
The helicopter was said to have been carrying "high-level business executives" when it crashed on a motorway in Buyukcekmece - an area on the outskirts of the Turkish city.
Hasan Akgun, the mayor of the Istanbul suburb of Buyukeekmece, said he saw five bodies recovered from the crash.
Turkish media images showed the helicopter in pieces and thick black smoke as rescue teams continued their search in Buyukcekmece, a western district of Istanbul.
It said two more people were injured in the crash.
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Witness Fikret Karatekin, a taxi driver, told CNN-Turk television by telephone that the helicopter slammed into the tower before crashing on the highway.
"It hit the tower and crashed by spinning", he said, adding that the highway had been closed down.
Authorities, however, didn't rule out a technical fault as the cause of the crash.
Eczacibasi is one of Turkey's top conglomerates that is involved in pharmaceuticals and building products. The DHA agency said four Russians were in the helicopter.
"The head of our company in Russian Federation, and also four our clients from Russian Federation - the guests who had arrived at our place - were aboard the helicopter".
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