UPDATE: A Pegasus Airlines plane landed safely at an Istanbul airport today after a passenger "said that there was a bomb on board" and wanted the plane to land in Sochi, Russia, officials with Turkey's Transportation Ministry said.
"While the plane was in the air, one of the passengers said that there was a bomb on board and asked the plane to not land in Sabiha Gokcen (in Turkey) but rather to land in Sochi," Transportation Ministry official Habip Soluk told CNNTurk.
The Winter Olympic Games started Thursday amid intense security against potential terror attacks. Official opening ceremonies are being held today.
A Turkish official says security forces are searching a passenger plane that landed at an Istanbul airport after a passenger claimed there was a bomb on board.
Sources told Al Jazeera that the plane, which had 110 people onboard, took off from Kharhiv in Ukraine and landed in Istanbul's Sabiha Gokcen Airport.
The plane sent a hijack alert as it was about to land after a passenger claimed to have a bomb, they said.
The official told the AP news agency the plane landed safely on Friday and was parked in a "safe area" at the airport where it is being searched.
The official spoke on condition of anonymity because of government rules that bar civil servants from speaking to journalists without prior authorisation.
The official denied a Dogan news agency report that a passenger on board tried to divert the plane to Sochi, Russia.
Reports said the plan was a Pegasus Airlines flight. A spokeswoman for the airline declined comment.