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.
More top news
The passenger rushing to catch a train at Ealing Broadway was headbutted after asking a man who was blocking his way to 'hurry up'.
The FBI is believed to have fitted a tiny microphone into a hotel key fob to spy on officials.
A modified version of the herpes virus has proved a major success in phase III clinical trials.