Police described the Austrian as an introvert and an avid player of online shooting games who had largely withdrawn from the outside world before he carefully planned Tuesday's attack.
The photo was published on X, they said.
Heute said the man had also published pictures of the pistol and the shotgun he would go on to use during the shooting on other social media.
Police have been scouring the perpetrator's electronic devices, and said on Thursday that they had not discovered any video of the high school shooting on his mobile phone.
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