Adam Khatib, 23, a factory worker from Walthamstow, east London, was part of a terror cell run from Pakistan. The cell was led by Abdullah Ahmed Ali, convicted of plotting to blow up transatlantic passenger airliners.
Co-defendant Nabeel Hussain was found guilty of engaging in preparing terror acts and Shamin Uddin was convicted of possessing terror items, namely a CD.
Deputy Assistant Commissioner John McDowall, head of the Metropolitan Police's counter terrorism command, said Khatib was a "footsoldier to Abdullah Ahmed Ali".
Uddin, 39, of Stoke Newington, north London, was also charged with engaging in conduct in preparation of terrorist acts but cleared by the court.
Hussain, 25, of Chingford, east London, was found guilty of preparing for terrorism by meeting Ali twice in July 2006.
He was also found guilty of possessing several items, namely a will, mobile phones and a £25,000 loan application, for use in terrorism.
Khatib was convicted by a majority of 11 jurors to one following an eight-week trial at Woolwich Crown Court in London.
Mr Justice Calvert-Smith adjourned sentencing until Thursday.
Khatib, who was a teenager when he was arrested, was a "loyal partner and servant" to Ali, travelling with him to Pakistan.
Uddin, 39, of Stoke Newington, north London, was also charged with engaging in conduct in preparation of terrorist acts but cleared by the court.
Hussain, 25, of Chingford, east London, was found guilty of preparing for terrorism by meeting Ali twice in July 2006.
He was also found guilty of possessing several items, namely a will, mobile phones and a £25,000 loan application, for use in terrorism.
Khatib was convicted by a majority of 11 jurors to one following an eight-week trial at Woolwich Crown Court in London.
Mr Justice Calvert-Smith adjourned sentencing until Thursday.
Khatib, who was a teenager when he was arrested, was a "loyal partner and servant" to Ali, travelling with him to Pakistan.
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