An Aer Lingus passenger plane travelling from Dublin to Rome was diverted to a French military airbase on Thursday following a bomb threat, the latest in a series of security alerts involving European flights this week.

The Airbus A320, carrying 151 passengers and six crew members, landed safely at Évreux Air Base 105 in Normandy after changing course while flying over France.

French military bomb disposal specialists were deployed to inspect the aircraft, while passengers and crew were reported to be unharmed.

The plane had been approaching the Paris region when it was diverted, circling before making its landing at the military facility.

French Prime Minister Sébastien Lecornu’s office confirmed that it was monitoring the situation.

Three more aircrafts were forced to land at Bulgarian airports following bomb threats, local media reported on Thursday, citing government ministers.

Two of the aircraft, flying from Copenhagen and Madrid respectively, landed in Sofia, broadcaster bTV reported, citing the interior minister, while NOVA TV cited the transport minister. A third aircraft, from London, had landed in Plovdiv, the reports said.

The incident follows a series of bomb threats involving passenger aircraft across Europe earlier this week, raising concerns over aviation security.

On Tuesday, a LOT Polish Airlines flight from London Heathrow to Warsaw was diverted to Warsaw-Modlin airport following a bomb threat, forcing the temporary closure of the airport.

The Boeing 737 MAX, carrying 181 people, landed safely before passengers were evacuated and security services began inspecting the aircraft.

A separate bomb threat was reported on an SAS flight travelling from Copenhagen to Warsaw, prompting additional security checks at Warsaw-Chopin airport.

A Wizz Air flight from London to Budapest was also diverted following a security alert.

Other flights, including Ryanair services, were affected by similar threats.

Authorities subsequently determined that the threats investigated on Tuesday were false.

It remains unclear whether Thursday’s incident involving the Aer Lingus aircraft is connected to the earlier alerts.

European aviation authorities and security services have not announced evidence of a coordinated campaign behind the incidents.

The latest diversion comes amid heightened scrutiny of aviation security following several days of disruption to European air travel.