Court is told Taunton-based Marine bought bomb-making materials online and posted them to his grandmother's home.
Both men, who were Romanian nationals, died at the scene.
News, sport, weather and travel updates from the West of England on Thursday, 27 July 2017.
The Biggest Weekend is taking place next May as Glastonbury has a year off.
The ill or injured acting servicemen and women are representing the UK in Toronto in September.
Wales tight-head prop Craig Mitchell suffers a long-term shoulder injury while training with Bath.
England leg-spinner Adil Rashid stars as Yorkshire inflict a sixth straight loss on Durham, while Worcestershire beat Notts.
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