A Russian extremist group banned at home in 2021 has rejected suggestions it sent hoax bomb threats that disrupted flights across Europe this week, after an email seen by the BBC warned of a threat.
European aviation faced a wave of false alerts this week. Authorities have treated the messages as hoaxes after searches found nothing.
The origin of the campaign remains unconfirmed. Officials have not publicly tied a named sender to every message received by carriers.
No devices were found on either of two planes that were among those that reported threats, or on any other flight that received such warnings.
It is not clear whether airports or airlines in other countries received the same or similar messages.
The initial message was sent on Thursday at 07:21 with the subject line warning of a threat. Scores of flights received similar alerts. No explosives were found on those aircraft or on any other that reported a bomb threat.