MOSCOW, November 7. /TASS/. A passenger plane en route from Istanbul to Yekaterinburg is preparing for an emergency landing in Sochi over cabin depressurization, a source in emergency services told TASS, adding that there are 100 people onboard.

"An emergency landing is being expected in the Sochi airport due to depressurization of the passenger cabin on the Istnbul-Yekaternburg flight. There are 96 passengers and 4 crew members onboard," the source said.

The plane is currently burning fuel over the sea. Two ambulance brigades are waiting at the airport.