A third teenager has been arrested in connection with a foiled attack on now-canceled Taylor Swift concerts in Vienna, Austria’s interior minister said Friday.

Austrian Interior Minister Gerhard Karner said an 18-year-old was taken into custody Thursday evening in Vienna after allegedly being in contact with the main suspect. Karner announced the arrest during an unrelated news conference Friday.

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Authorities say the plot appeared to have been inspired by the Islamic State group and al-Qaida. Investigators found bomb-making materials at the main suspect’s home. Officials say that teenager has confessed to planning to “kill as many people as possible outside the concert venue” using knives or homemade explosives.