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Paul Mason told the BBC that the unusual scale and apparent credibility of the threats suggested a deliberate act, rather than coincidental malicious calls.

The correspondent said investigators had no immediate evidence of a hostile state being behind the threats.

No country had attributed blame for the threats, according to the report.

The source of the bomb threats was not immediately clear.

Robinson said the identity of whoever was behind the threats was not known to her and expressed hope that authorities would identify them.

The article says authorities had not confirmed a link between any of the threats.

Megan Williams said the group claiming responsibility was unfamiliar to her and that the perpetrators were not known.

No authority had confirmed a link between the threats, and it remained unclear who, if anyone, was behind them.

No authorities had confirmed a link between the threats or identified who was behind them.

There was no intelligence pointing to a particular group or state actor as responsible for the threats.

The transcript reports no claim of responsibility for the threats.

The Metropolitan Police Aviation Section was working with international counterparts to investigate the threats.

Italian media reported that a group calling itself, in rough translation, the “fighters of the male” or “patriarchal state” claimed bombs had been planted in two flights from Helsinki and Dublin bound for Rome Fiumicino.

Threat emails to airports in Rome and Sofia were reportedly signed “fighters of the Male State.”

A claim attributed to an anti-feminist group in Italy had not been verified as credible.