France is expected to detonate its first nuclear device in the next few days.

预计法国将在未来几天内引爆它的第一个核装置。

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Based on investigative leads and information provided by Dzhokhar Tsarnaev, investigators believe that each of the brothers had their own remote control device to detonate bombs near the marathon's finish line, said a law enforcement official with knowledge of the investigation on Friday.

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The court has previously heard that the device in the Jeep failed to detonate.

BBC: Suspect 'threw bomb from vehicle'

The device failed to fully detonate, instead setting off a fire at the man's seat.

CNN: UK to tighten airport security after failed bombing