German town of Haltern in mourning after loss of 16 students and two teachers in plane crash . Group was returning from school exchange trip to Spain when aircraft went down in Alps . Headteacher says school is in mourning , classmates struggling to understand what happened .
German town of Haltern in mourning after loss of 16 students and two teachers in plane crash . Group was returning from school exchange trip to Spain when aircraft went down in French Alps . Headteacher says school is in mourning , classmates struggling to understand what happened .