The headteacher of Langdon Park School has said that "out of all his students", Amjol Amol was the "least likely" to be involved in violence. Chris Dunne added that the teenager had been working in Northern Ireland to promote peace in local communities.
A post-mortem is due to take place tomorrow.
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On the lawns of the palace, thousands of people stood silently in tribute to the 22 people killed in the blast and the 59 injured.