Though inspired by ISIS, the sources said investigators do not believe the alleged plot was directed by ISIS operatives.
U.S. intelligence found at least one of the suspects pledged to ISIS-K on the messaging app, Telegram, in early July, the sources said.
Investigators are not convinced that the alleged plot would have worked and they do not know if a functioning bomb was produced. However, Viennese investigators did find explosive precursor chemicals which showed a degree of motivation and planning, sources told ABC News.
Before the shows were canceled, Ruf said security at the concerts would be increased. The shows were expected to draw 65,000 concertgoers per day, with an additional 10,000 to 15,000 fans outside of the area, police said.
Swift kicked off the massively successful “Eras Tour” in Glendale, Arizona, on March 18, 2023.
Investigators in Austria are looking at surveillance footage to determine whether one or more of the suspects had previously visited the concert site for reconnaissance or if they had visited other potential targets.
As ABC News has previously reported, law enforcement officials have been concerned about mass gathering attacks since the deadly Moscow concert hall assault earlier this year for which ISIS-K claimed credit.
In October 2023, the pop star released a concert film chronicling the record-breaking tour, “Taylor Swift: The Eras Tour,” that went on to break records of its own and earn a Golden Globe nomination.
