Today's disruption follows at least seven flights being searched across Europe on Tuesday after a series of suspected bomb threats.

Two flights were searched after landing in Rome, two in Warsaw, two in Sofia, with one landing in Murcia in Spain - no explosives were found on any of the planes.

Two of these flights took off from the UK - one from Heathrow and one from Manchester.

There is no confirmed link between any of the threats, either from Tuesday or today. But authorities from various countries have been co-operating to assess whether this is a co-ordinated attack.

The UK government described the events as "malicious hoax threats" and said that there are "well-tested processes for dealing with any potential threats".

With bomb threats, the cost to sender is low - but the cost to airlines can be far higherpublished at 11:28 GMT

11:28 GMT

By Thomas Copeland

An aviation safety expert has told BBC Verify this week’s bomb threats are "most likely a hoax, but the system is right to treat it as real".

Marco Chan, senior lecturer in aviation operations at Kingston University and former Cathay Pacific pilot, says hoax threats are seen by some experts as "possibly part of a pattern of cheap, deniable disruption" to air travel.

He adds that "hoax waves can also come from copycats or a handful of individuals", but that "three days of incidents is too small a sample to separate co-ordination from contagion".

Chan says the "cost to the sender is almost nothing" compared to the significant impact on airlines, airports and air forces.

"That asymmetry is the point of the tactic, whatever the motive."

In this case of this morning’s Aer Lingus flight which was diverted to a military airfield in northern France, Chan says that "diversion, escort, and isolation" at a military site shows the "high cost of false alarms to avoid a single missed attack".

There were no explosives found on the four planes heading to Prague which received threats, a police spokesperson tells CTK news agency.

Earlier, we reported that Czech police were preparing to receive four flights, after threats about an "improvised explosive device".

Budget airline Wizz Air says its flight from Milan Malpensa to Warsaw has been diverted to Vienna after a bomb threat was received during the flight (this flight was on our initial list earlier).

"The diversion was initiated in accordance with established security protocols and procedures, with the safety of passengers and crew as the highest priority," a Wizz Air spokesperson says.

"This incident comes amid a series of similar bomb threats affecting several airlines across Europe in recent days.

"Wizz Air is not the only airline targeted, with other carriers also experiencing threats resulting in flight diversions and security checks."

More now from Bulgaria, where the air force says it successfully carried out an "air policing" mission following bomb threats to three flights.

As we just reported, three Ryanair flights to Sofia, from Copenhagen, Madrid and London, were reportedly targeted by the suspected bomb threats.

The air force says MiG-29 fighter jets took off from Bulgaria's Graf Ignatievo Air Base at 10:11 local time (08:11 GMT) to "intercept and escort the civilian aircraft".

"One landed at Plovdiv Airport, and the other two at Vasil Levski Airport in Sofia," the air force adds.

Mircea Barbu
In Bucharest

In Bulgaria, the Ministry of Transport has confirmed that bomb threats were made against three aircraft arriving in the country.

Two of the aircraft have already landed at Vasil Levski Airport. The flight from Madrid landed at 10:15, while the flight from Copenhagen arrived in Sofia at 10:19. No explosive devices have been found.

The third aircraft, arriving from London, is yet to land and is expected to arrive at Plovdiv Airport.

All three aircraft are operated by Ryanair.

Image source, Reuters

On-board messages reveal threat was passed on by air traffic controlpublished at 11:01 GMT

11:01 GMTBreaking

By Emma Pengelly

Aer Lingus flight El402, from Dublin to Rome, sent a series of messages between the aircraft and ground stations.

These messages have been interpreted by aviation safety expert Marco Chan, who says the messages in the log give "a clear account of the diversion".

The ACARS (Aircraft Communications Addressing and Reporting System) messages were published by Airframes and can be considered reliable for what was transmitted and when.

• At 07:51 GMT - The aircraft reports it is diverting to Paris Charles de Gaulle airport
• 07:54 - The crew tell Dublin operations that air traffic control has passed on a bomb-on-board threat
• 08:03 - The crew reports that the fuel level required to proceed to Rome is no longer assured
• 08:28 - Weather reports for Toulouse, Brest and Nantes, suggesting alternate destinations are being considered
• 08:40 - Plane reports diversion to Evreux Air Base, west of Paris, on government order

Chan, who is also a former airline pilot, says that although ACARS spoofing - the act of sending false messages - is possible, corroboration between the messages and known details of the affected flight makes it very unlikely in this case.

Davide Ghiglione
In Rome

A spokesperson for Aeroporti di Roma tells the BBC that security checks have now been completed on a Finnair flight from Helsinki that landed safely at Rome Fiumicino Airport at around 09:30 this morning, following anonymous reports of a suspected bomb threat.

The aircraft was escorted into the airport by Italian Air Force fighter jets, while bomb disposal operations were launched in line with standard security procedures.

Police bomb disposal experts carried out the inspections, which returned a negative result, with no explosives found on board, according to information received from the airport.

The spokesperson said the security checks proceeded as normal and had no impact on airport operations.

A flight from Warsaw to Brussels - which we mentioned in our round-up earlier - has landed safely and no suspicious items were found, Polish airline LOT says.

"Following receipt of information regarding a potential security threat to flight LO235 from Warsaw to Brussels, the flight crew was notified of the situation and conducted an onboard inspection in accordance with established procedures," a LOT spokesperson says, according to Reuters news agency.

Security services carried out an additional inspection after landing, where "no dangerous or suspicious items were found", the spokesperson adds.

Mircea Barbu
In Bucharest

Nearly 200 passengers were evacuated from a Wizz Air flight travelling from Milan to Bucharest on Thursday following a bomb threat.

Flight WMT3064 landed safely at Bucharest’s Henri Coandă International Airport at 11:08 local time.

Airport officials said passengers had been evacuated and emergency procedures activated in cooperation with state institutions.

"Passengers have been disembarked. The airport has taken the procedural measures required in such cases, in cooperation with state institutions.

"A crisis management unit is being established, and specific procedures for these situations are being implemented," airport representatives told BBC.

A specialist explosives disposal team from Romania’s Intelligence Service (SRI) is inspecting the aircraft.

Bucharest National Airports Company said air traffic was operating safely and without disruption, with flights continuing according to schedule.

• See our earlier list of other affected flights here

Police in the Czech Republic say they're "preparing for landing" of four flights heading to Prague, after "receiving a threat regarding the placement of an improvised explosive device".

"We assess the relevance of the threats as low," Czech police write on X, who say "pyrotechnic inspections will be conducted on all aircraft" after landing.

Across Europe, there are several reports of flights being impacted by bomb threats, with information still emerging.

So far on Thursday, those flights include:

• Aer Lingus Dublin to Rome, diverted to Evreux airbase
• Finnair Helsinki to Rome, landed in Rome
• Wizzair Milan to Warsaw, diverted to Vienna
• LOT Warsaw to Brussels, landed in Brussels

• Ryanair Copenhagen to Sofia, landed in Sofia
• Ryanair to Madrid to Sofia, landed in Sofia
• Ryanair London to Sofia, diverted to Plovdiv

We are working to confirm details with the respective airlines, and will provide further information shortly.

Image source, Reuters

Multiple flights across Europe have been impacted by bomb threats - two days after at least seven flights were affected by similar threats.

One of those affected today was an Aer Lingus Airbus A320 plane which departed Dublin for Rome, issued an emergency alert, diverted and landed at Evreux air base in northern France.

Meanwhile, Finnish airline Finnair said there was a bomb threat against one of its planes travelling from Helsinki to Rome on Thursday. It was escorted by air force jets and landed as scheduled.

This is a breaking news story, stick with us as we bring you more information.