A fourth teenager has been arrested in connection to the thwarted terror plot aimed at one of Taylor Swift’s concerts in Vienna last summer.

Germany has charged a Syrian juvenile with supporting a foreign terrorist organization for helping to plan a foiled attack on a Taylor Swift concert in Vienna last year, the prosecutor general said in a statement on Friday.

The youth, a Syrian who lives in Germany, was accused of helping to interpret bomb-building instructions and of translating an oath of allegiance to the Islamic State for the main suspect.