Welcome Back. 15 people shot dead by a seventeen year old .. with no apparent motive -- has caused shock and horror in Germany. This latest incident brings back disturbing memories of a similar shooting in the east German town of Erfurt seven years ago - the first attack of its kind in Germany. Then - as now.. people are at a loss to explain what unleashed this mindless violence - and for those caught up in the midst the tragedy - the scars will take long to heal.