A new wave of bomb threats disrupted air traffic across Europe on Friday, according to the Guardian. The affected aircraft landed safely, and searches found no explosive devices.

At least 18 flights to or from Bulgaria, Cyprus, Czechia, France, Hungary, Italy, Portugal, Romania and the UK were affected. Danish police investigated a threat against Copenhagen airport, but the airport's management said it was operating normally.

Earlier threats on Tuesday and Thursday forced at least 35 flights to be diverted or searched. The affected Friday flights were 0.0674% of the 26,709 flights scheduled in Europe that day, according to the air traffic control agency Eurocontrol.

Hungary scrambled fighter jets three times to escort civilian flights in its airspace, Defence Minister Romulusz Ruszin-Szendi said on Facebook.

Separately, threats against media organisations in Ireland disrupted broadcasts and prompted staff evacuations and police searches of offices and newsrooms. The British broadcaster Sky said it also received a security threat and reported it to the relevant authorities.

Irish Taoiseach Micheál Martin told RTÉ Radio 1 that such threats must be taken seriously. "It shows how relatively simple it can be to cause disruption and undermine the normal operation of society," he said. He added that European security agencies would seek to identify those responsible.

Several European outlets reported that a group claiming responsibility for this week's threats sent an email warning of further attacks on transport across Europe. The email reportedly said, "This is only the beginning." The Guardian said it chose not to reproduce the email in full because of its unsubstantiated claims.

Some Thursday threats were signed "fighters of the Male State," a reference to a Russian far-right movement. In a Telegram post, the group's founder, Vladislav Pozdniakov, denied involvement and said the group had not existed since 2021.

Investigators have said there is no evidence that hoaxes against airlines and other targets were orchestrated by a hostile terror group or state actor, such as Russia or Iran. Inquiries are continuing. Some officials suspect the disruption is linked to European support for Ukraine. Spanish Foreign Minister José Manuel Albares said authorities need more time to identify culprits but that there appears to be a pattern. He said the most reasonable assumption is "an attempt at hybrid aggression and a form of psychological warfare."

Italian Prime Minister Giorgia Meloni said it was unclear whether the hoaxes and recent cyber-attacks on supermarket refrigeration systems in at least seven European countries were "all connected." She said they "definitely all tell us the same thing: today, what is under attack are civilian infrastructures."

Metropolitan Police Commissioner Mark Rowley urged a measured response. "We are going to have to adapt to that same methodology to make sure that we don't overreact to every message we get online," he told BBC Radio 4.

NATO continues to monitor the situation and is working closely with allies, according to a senior NATO military official.