Bomb threats had been reported on a number of passenger flights throughout Europe on Thursday, and a few of the planes have already landed safely.
Three plane flying from Copenhagen, Madrid and London to the Bulgarian capital Sofia obtained bomb threats, Bulgarian media reported.
Meanwhile, a LOT Polish Airlines flight from Warsaw landed safely at Brussels Airport, the report mentioned.
Earlier, there was a suspicious report in regards to the plane, the report added. (Xinhua/NAN)
