Nine high school students and a teacher are now known to have died in a mass shooting in Graz, Austria's second largest city, apparently at the hands of a former pupil.

The 21-year-old man suspected of this week carrying out Austria's worst school shooting was likely an introverted fan of online shooting games, criminal investigators said on Thursday. The Austrian man,

Eleven people injured in a school shooting in Graz, Austria, on Tuesday are still being treated but are not in life-threatening condition, officials said.

Videos from social media show the moment loud gunshots were heard in a classroom, during a deadly school shooting in Graz, Austria. Footage shows people panicking and looking outside through a window, as gunshots ring out in the background. Other footage shows armed police officers inside school corridors as pupils run towards the exit.