Previous reports said that five persons, including four Russians, died in the helicopter crash.
A fire-fighting helicopter has crashed near Istanbul on Friday.
A helicopter carrying top business execs has crashed onto a motorway after smashing into an atrial tower. Two pilots, four foreign nationals and a Turkish citizen are reported to have been on board, RT reports.
Istanbul governor Vasip Sahin confirmed five of them were killed.
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.
The Sikorsky S-76 commercial utility helicopter hit a tower of TV before it crashed in the district of Beylikduzu, Xinhua news agency repoorted.
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The cause of the crash was under investigation, he said.
A nearby highway was closed after it was littered with debris from the crash.
The emergency centre for Russians overseas said the four Russians on board were amongst those killed.
Eczacibasi Grup is a group of 49 companies operating in the spheres of activity ranging from the production of building materials to medicinal preparations and consumer goods.
The Turkish national who was killed headed the company's operations in Russian Federation, he said.