Several flights across Europe were diverted or made emergency landings on Thursday following bomb threats, prompting security checks by authorities.

Finnair said Flight 1761 from Helsinki to Rome was targeted by a bomb threat but landed safely in the Italian capital, where no suspicious items were found on board, Finnish broadcaster Yle reported.

Three Ryanair flights heading to Sofia, Bulgaria, also faced bomb threats. Two flights, from Copenhagen and Madrid, landed safely at Sofia’s Vasil Levski Airport, while another from London’s Stansted Airport was diverted to Plovdiv, Bulgaria’s second-largest city.

Separately, an Aer Lingus flight from Dublin to Rome was diverted to a military air base in Evreux, Normandy, in western France, following a bomb threat, the French prime minister’s office said.

All 151 passengers and six crew members were safe after the plane landed. Military bomb disposal teams were examining the aircraft, while Prime Minister Sebastien Lecornu’s office said it was monitoring the situation.

Flight-tracking websites showed the aircraft changed course near Paris, made several loops and then headed towards Evreux.

Several other flights operated by LOT, Scandinavian Airlines, Wizz Air and Ryanair also received hoax bomb threats this week, leading to searches, diversions and, in one case, an escort by the Italian air force.

The latest incidents came a day after a Bulgaria-bound flight was diverted to Hungary following a similar threat. No one was injured.

Although such threats are not new, the incidents come amid heightened geopolitical tensions and growing concerns over disruptions across Europe, including attacks on supermarket refrigeration systems, drone incursions and suspicious alerts on emergency apps. Authorities have also warned of increasing hybrid threats.