A chilling theory suggests the missing Malaysian Airlines plane could have been hijacked using a mobile phone or USB stick.
An anti-terror expert believes the speed, altitude and direction of the aircraft could have been changed, simply by sending radio signals from a small remote device.
A framework of 'codes' created by cyber terrorists would also be able to get into the plane's in-flight entertainment system and override the security software.
It is also believed, once the systems have been successfully hacked, the plane could be landed by remote control.
The theory has emerged as the search for flight MH370 continues to grow, with 25 countries now involved in the rescue effort.
Yesterday, Malaysian Prime Minister Najib Razak confirmed the plane's disappearance was the result of a 'deliberate act' and could have flown as far as Kazakstan.
Dr Sally Leivesley, a former Home Office official, said: 'It might well be the world’s first cyber hijack.'
Dr Leivesley, who now prepares businesses and governments for potential terrorist attacks, told the Sunday Express: 'There appears to be an element of planning from someone with a very sophisticated systems engineering understanding.'
'This is a very early version of what I would call a smart plane, a fly-by-wire aircraft controlled by electronic signals.'
She added that once the plane is air-side, you can insert a set of commands and codes which can begin a new set of processes.
One phone even made it through with a video that captures the last minutes of the flight with people screaming, etc. 
