Charging documents outlined an ambitious plan involving explosive-laden drones and rifles, but left less clear that the conspirators had the means to carry it out.
Mohammad Baqer Saad Dawood Al-Saadi is accused of directing and urging others to attack American and Israeli interests. Prosecutors say he is a leader of Kataib Hezbollah, an Iraqi militia with ties to Iran.
Austrian prosecutors said the man plotted in 2024 to set off a bomb outside the concert, which was later canceled. He and another man still face separate charges.