Austrian law enforcement officers have arrested two people suspected of planning a major attack on Taylor Swift’s upcoming concert in Vienna.

Police said one of the men, 19, had pledged allegiance to ISIS. Both suspects had become radicalized on the internet and had specific plans to carry out an attack, officials said. The 19-year-old was arrested with chemicals found by an Austrian bomb squad, and investigators are now determining if they could have been used to make an explosive.

The 19-year-old was arrested in Ternitz, an hour south of the capital, while the other man was taken into custody in Vienna.

Swift has performances of her Eras Tour scheduled for Thursday, Friday and Saturday night at Ernst Happel Stadium in Vienna. Paramore is set to appear as a special guest.

The concerts are set to move forward after police said there are plans to increase security and that “the concrete danger has been minimized,” according to NBC News.

More to follow.

Bebe King, Elsie Dot Stancombe and Alice Dasilva Aguiar (Merseyside Police/PA)