At least seven people have been killed after a helicopter reportedly crashed into a television tower in dense fog on the outskirts of Istanbul.
Istanbul's governor Vasip Sahin said the helicopter, which belonged to a private company, crashed after taking off from Istanbul's Ataturk Airport and came down on a highway on the edge of the city.
Mr Sahin said the cause of the crash is under investigation.
The private Dogan news agency said the people on board included four Russian nationals, a Turkish citizen and two pilots.
Video footage from the site showed thick black smoke rising from the highway and wreckage scattered on the road.