Austrian security officials said Thursday that the main suspect of the two arrested in a foiled plot to attack now-canceled Taylor Swift shows in Vienna fully confessed to his plans to “kill as many people as possible outside the concert venue.”

Officials told reporters at a press conference in the Austrian capital that they found ties to the Islamic State group, and when the 19-year-old began working on his attack plans in July, he quit his regular job and “conspicuously changed his appearance and adapted to IS propaganda.”