School officials and classmates said the stabbing of Mr.Jimenez was a final confrontation in a feud between the two youths that had been simmering since September. No one claimed to know how the bad blood began.

• 校方人员和班上的学生说，这两个青年之间自去年九月就酝酿着仇恨，希门尼斯被刺杀乃是最后摊牌。至于仇恨如何开始则无人表示知晓。