He pointed to the case of a Saudi man, Khalid Ali-M Aldawsari, who was convicted last year of attempting to use a weapon of mass destruction.

WSJ: FBI Uses 'Tripwires' to Catch Bomb Makers

Among the recent examples cited by Boyd was the case of Saudi student Khalid Ali-M Aldawsari who was convicted and sentenced to life in 2012 for attempted use of a WMD.

CNN: WMD: From A-bombs to pressure cookers

Mr Naseer denies five counts, Mr Khalid four and Mr Ali three, all between Christmas Day 2010 and 19 September 2011.

BBC: Terror trial: 'Public duped into funding bomb plotters'