Several flights across Europe faced disruption on Tuesday after receiving bomb threats that later proved to be hoaxes, prompting security searches, diversions and a military fighter jet escort, officials said.

Flights operated by Ryanair, LOT, Scandinavian Airlines (SAS) and Wizz Air were affected. No injuries were reported.

In Italy, two Ryanair flights from Lisbon and Dublin to Rome received bomb threats. The Italian Air Force escorted one of the aircraft to Rome's Fiumicino Airport, where security checks found no explosives.

In Poland, a LOT flight from London to Warsaw was diverted to Modlin Airport, while a separate SAS flight from Copenhagen triggered security procedures at Warsaw's Chopin Airport. Both aircraft were cleared after inspections, and normal operations resumed at Modlin.

Spanish authorities also found no explosives aboard a Ryanair flight from Manchester that landed at Murcia Airport following a threat. The aircraft carried 121 people, including crew members.

In Bulgaria, two aircraft arriving from Italy and Ireland were inspected after receiving bomb threats, but no explosives were found.

The incidents followed a similar threat on Monday that forced a Wizz Air flight from London's Luton Airport to divert to Hungary. A Hungarian Gripen fighter jet escorted the aircraft to Budapest, where inspections found no threat.

Bulgarian authorities are investigating the source of the threats, officials said.