Wire reporting: (AP, via Toledo Blade), (Reuters, via ABC News Australia)

European airlines and several newsrooms received a new round of bomb threats on Friday, the third cluster of aviation alerts this week, officials and outlets said, with no explosives reported found^1,3.

Flights serving Lisbon, Rome, Prague and Sofia were among those targeted, the BBC said, and Hungarian authorities said three passenger aircraft were escorted by fighter jets^1,5. Czech police logged threats against nine Prague-linked flights, an airport spokesperson said none were cancelled, and France said four threatened aircraft over its territory landed safely^3,5.

A Ryanair service between Lisbon and Rome was among those named, and an Italian airport source told ABC a Wizz Air flight from Prague to Rome was diverted to Venice^1,3. The Friday alerts followed threats earlier in the week that the BBC said affected nearly 30 aircraft and several airports, which the United Kingdom described as a malicious hoax^1,2,6.

The same day, emailed warnings reached television and radio newsrooms, including Ireland's public broadcaster RTÉ, which evacuated its Dublin campus, and Bulgaria's Nova TV^1,3,4. Politico Europe reported that RTÉ, Virgin Media TV, the Irish Independent and Newstalk received identically worded emails⁵.

Sky said it had received a security threat, carried out an assessment and notified authorities, the BBC reported^1,3. SCMP said the television-station messages warned that the clock was ticking and that some programming was suspended⁴. Irish police said they were aware of a threat against media organizations in Ireland and elsewhere in Europe¹.

The Irish government said it was not yet known whether individuals or a centralized effort were responsible and described a likely coordinated campaign of disruption^1,5. Prime Minister Micheál Martin said the situation was worrying and that public safety was the first priority, adding that there had appeared the day before to be coordinated efforts to disrupt air travel¹.

A government official told Politico Europe the spike in disruptions appeared timed to next week's European Political Community meeting in Dublin; Ireland is due to host high-profile European gatherings^1,5.

ABC said emails to RTÉ and Nova TV were signed with the name Mikhail Andropov and framed as a message to the West; Reuters, as carried by ABC, could not confirm the sender or a common origin with the flight alerts³. The BBC said no concrete link had been established between the airline threats and those against broadcasters¹.

Spain's foreign minister said the continent appeared to be facing hybrid aggression, ABC reported, while a group named in earlier Italian airport emails denied any role^1,3. Authorities have not publicly attributed Friday's messages to a state, and searches had not turned up explosives as of Friday^1,3.