Messages reveal how hoax threat was passed on by air traffic control

More than 20 aircraft across Europe have been targeted by bomb threats. It's the second time this week, which the UK has called a "malicious hoax". BBC Verify has been analysing the messages sent by an aircraft to find out what happens when a flight receives a bomb hoax - as Thomas Copeland explains. Bomb hoaxes: Messages reveal how threat was passed on by air traffic control.

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