Istanbul (CNN) -- Two flights from Lahore, Pakistan, received anonymous e-mails saying bombs were aboard the planes on Wednesday, officials said.
One plane flying to Manchester, England, was diverted to Istanbul on Wednesday, said Mohamed Mashood Tajwar, a spokesman for Pakistan International Airlines.
The plane landed in the Turkish city because it was the nearest airport, he said. It was carrying 346 passengers, he said.
Anadolu Agency, the state news service, said the threat was received while the plane was over air space in neighboring Bulgaria.
Passengers were evacuated and security forces searched the plane with sniffer dogs, Anadolu reported.
The other flight -- from Lahore to the Malaysian city of Kuala Lumpur -- safely reached its destination of Kuala Lumpur, Tajwar said. It was carrying 172 passengers.