At least 14 European flights, including those of AirLingus, Visair, FanAir, Ryanair and Lottery, were the target of bomb threats on routes to Rome, Warsaw, Sofia, Brussels, Vienna, Bucharest and Prague; The threats that led to the rerouting of several flights and the launching of military fighter jets. These threats include flights from Dublin to Rome, Milan to Warsaw, Helsinki to Rome and Vienna, London to Sofia, Madrid to Sofia, Copenhagen to Sofia, Warsaw to Brussels and Milan to Bucharest. Fighter jets from Italy, France and Bulgaria were flown in to escort some planes and some flights were diverted to alternative airports. European officials announced that all the planes that were checked landed safely and no explosives were found. The European Union said on Thursday that it was still unclear whether these threats were linked. Their origin and motive are still unknown.