A 'bullied' drop-out who turned his former school into a bloodbath on Tuesday as he massacred 10 students in a gun rampage had sent his mother a farewell video just moments before he opened fire.

Investigators found the message yesterday when they searched the home of the 21-year-old shooter who took his life after his attack at BORG Dreierschützengasse high school in the city of Graz.

Cops did not elaborate on investigators' findings in a brief post on social network X.

But a senior official who acknowledged that the message had been found on Tuesday night said it hadn't allowed them to draw conclusions.

Franz Ruf, the public security director at Austria's Interior Ministry told ORF public television that a 'farewell letter' had also been found.