Bomb threats diverted airliners across Europe on Thursday morning, Reuters reported, extending a recent run of alarms.
Aer Lingus said its Dublin-Rome flight EI402 was rerouted for security reasons and landed safely at Evreux airport, 100 kilometers (62 miles) west of Paris.
Belgian media said the airliner forced down at Brussels' Zaventem airport belonged to LOT, a Polish carrier.
Italy's air force safely escorted a Finnair plane from Helsinki to Rome, a person familiar with the matter said.
Bulgarian officials said three planes made emergency landings after bomb threats. Two, from Copenhagen and Madrid, came down in Sofia, the interior minister said, according to bTV, and a third, from London, in Plovdiv, local media said.
A LOT Polish Airlines flight traveling from Warsaw touched down without incident at Brussels Airport after a suspicious report was made, according to a source cited on Thursday, corroborating reports from Belgian media outlets. Airport representatives told Belgian press that no extra security precautions were required, though the airport did not immediately reply to Reuters' request for comment.
The incident follows a wave of bomb threats targeting at least seven flights and a cruise ship across Europe on Tuesday, which disrupted airport operations even though no explosive devices were found.
No country has assigned blame, but European officials accuse Russia and Iran of what they call "hybrid attacks" and sabotage, Reuters reported. Moscow and Tehran reject any such campaign.
Unidentified hackers also shut down supermarket fridges in several European countries this week, Reuters noted. Some experts said hoax threats could fit a similar low-cost, deniable approach.
The story is developing.
