A Ryanair flight from Lisbon landed at Rome’s Fiumicino airport after an email reported a bomb on board, according to an official with knowledge of the events. Police bomb disposal experts carried out security checks and found no explosives. Another Ryanair flight from Dublin to Rome also received a bomb threat and was escorted by the Italian Air Force, which confirmed it scrambled two Eurofighter jets to respond.

In Sofia, Bulgaria, two planes—operated by Wizz Air and Ryanair—landed safely after bomb threats were received by email. The Wizz Air flight from Bergamo carried 176 passengers, while the Ryanair flight from Dublin had 185 on board. No explosives were found during inspections. A day earlier, a Wizz Air flight from London to Sofia was diverted to Budapest after a similar threat, according to Hungarian Defence Minister Romulusz Ruszin-Szendi.

In Poland, a LOT flight from London’s Heathrow to Warsaw’s Chopin Airport was diverted to Modlin Airport after a bomb threat. The airport was temporarily closed while the plane was searched. LOT later said nothing was found on the aircraft, and normal operations resumed.

A Ryanair flight from Manchester to Murcia, Spain, also received a bomb threat, leading to a partial airport closure. Spanish delegate Francisco Lucas said authorities found no explosives after inspections and the airport resumed normal operations.

An Israel-bound cruise ship was searched in Greece after a bomb threat was reported, according to CBC News. No explosives were found.

Rhys Jones of Osprey Flight Solutions said seven confirmed bomb threats in one day was “exceptional,” noting the lack of a clear target suggested the aim was general disruption. Matthew Borie of the same firm suggested the incidents could be part of hybrid warfare tactics, possibly involving state actors.

No group has claimed responsibility for the threats, and no injuries were reported. The UK government said its aviation security system has “well-tested processes for dealing with any potential threats,” according to a government spokesperson. The Metropolitan Police confirmed its aviation unit was monitoring the situation.