An Austrian Airlines plane traveling from Tel Aviv to Vienna landed in Bulgaria's capital Sofia following a suspected security incident. Passengers were informed that an 'anonymous bomb threat on the plane' had been received. After the plane took off for its destination in Vienna and had already left Israeli airspace, the airline received a message from an Austrian citizen claiming there was a bomb on board. After landing in Bulgaria, passengers were disembarked and the plane is undergoing inspections and being cleared.