Three Taylor Swift concerts in Vienna were canceled due to an apparent plot to launch an attack at the Ernst Happel Stadium. Two suspected extremists were arrested, with one having pledged allegiance to the Islamic State group.
Key Points
Arrest of two suspected extremists over a planned attack at the Vienna concerts
Main suspect, a 19-year-old, had pledged allegiance to the Islamic State group
Chemical substances were secured and being evaluated
Increased security measures announced before cancellation of concerts