Police said the shooting near the landmark Bellagio fountains was an isolated incident between the victims and the suspect, who had been feuding on social media.

Police described the Austrian as an introvert and an avid player of online shooting games who had largely withdrawn from the outside world before he carefully planned Tuesday's attack. Newspapers Heute and Kronen Zeitung published details of a photo the young man apparently took inside a toilet cubicle with a timestamp minutes before police said the attack began in the school in Graz,