Yesterday morning (Aug 30) an hijacking warning was issued for an Alitalia flight from Miami to Milan. Flight AZ 637, scheduled as a Boeing 767, was escorted over French airspace by French AF Mirage fighter jets, and later by Italian AF jets due to a suspected terrorist on board. Also, MXP airport was closed for half an hour while this plane was landing. The flight was completely uneventful, the passengers were just asked to keep their seatbelts fastened due to "turbulence". After landing, both the plane and its passengers were searched for weapons, but nothing was found.
Source: www.ansa.it, www.tgcom.it (Italian only)