Two Pakistan International Airlines planes have been forced to land because of bomb threats, one in Turkey and one in Malaysia. Both landed safely.

Turkey's state-run Anatolia news agency says a jet carrying 378 passengers was on its way to Britain Wednesday, when it made an emergency landing at Istanbul's Ataturk Airport.

The plane was evacuated, and security officials with sniffer dogs searched the aircraft.

The flight began in Islamabad and was on its way to Manchester. Turkish state-run media say a bomb threat was received about the Boeing 777 while it was flying over Sofia, the capital of Bulgaria.

A second plane from Islamabad carrying 176 passengers landed safely at its destination in Kuala Lumpur, Malaysia.

Media reported the threats were delivered by email.