"Boy, 12, 'directed by Isis' tries to bomb German Christmas market " The Independent

"
A passer-by called police about the suspicious bag on 5 December and detectives found what appeared to be an improvised explosive device.
It was composed of a jar filled with powder and a wire, with nails taped around the outside..."

http://www.independent.co.uk/news/world/europe/boy-12-directed-by-isis-nail-bomb-german-christmas-market-ludwigshafen-islamic-state-a7479121.html