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A teenage Iraqi asylum-seeker who told police he had been trained by the Islamic State group has been sentenced to at least 34 years in prison for bombing a London subway train and injuring 51 people.

A judge gave 18-year-old Ahmed Hassan Friday a life sentence with a requirement that he serve a minimum term of 34 years. A jury last week convicted Hassan of attempted murder in the September 2017 attack.

Judge Charles Haddon-Cave called Hassan "a dangerous and devious individual" and said he plotted the subway bombing with "ruthless determination" while pretending to be a model asylum-seeker.

The homemade bomb he placed on a packed London Underground train only partially detonated at Parsons Green station. Prosecutors said there probably would have been fatalities if the device had functioned properly.