At least 12 European flights were targeted by bomb threats on Thurday, with several planes receiving fighter jet escort and at least two flights diverted, authorities and airlines said.
It was the third day of mass bomb alerts this week and particularly targeted low-cost carriers on European flights.
An airliner heading from Dublin to Rome was rerouted to France, where it was escorted by military aircraft after a suspected bomb threat, French authorities said.
According to the Flight Radar tracking website, the diverted plane appeared to belong to the Aer Lingus fleet.
France's air force said it had dispatched planes "as soon as the threat was reported".
"The aircraft has been diverted and is being escorted to the Evreux airfield" west of Paris, it added.
Hoax bomb alerts were also reported on a Finnair flight from Helsinki to Rome and a Wizz Air flight from Milan to Warsaw on Thursday, with the Wizz Air jet rerouted to Vienna, the airlines said.
The Helsinki-Rome flight was escorted to Rome by a fighter jet and checked by bomb disposal experts, an airport spokesman told AFP.
Wizz Air said in a statement that "the diversion was carried out in accordance with established safety protocols and procedures".
The incidents followed bomb threats targeting about ten European flights on Tuesday, forcing the brief closure of a Warsaw airport and the deployment of Italian air force jets to protect flights, according to authorities. Those threats turned out to be hoaxes.
On Monday, a Wizz Air flight from London's Luton airport to Sofia was diverted following a bomb threat and forced to make an emergency stop in Budapest.
This is a developing story and more information will follow.
