Austrian police have detained a third alleged Islamic State group sympathiser over a plot to carry out a suicide attack at a Taylor Swift concert in Vienna, authorities said Friday. The United States provided the tip of the threat to this week's "Eras" tour concerts which have been cancelled, the US administration said. Austrian police on Wednesday arrested suspects aged 19 and 17 over a plot to kill "a large number of people" at one of the three gigs, which were meant to start Thursday, according to authorities.

Interior Minister Gerhard Karner said that "an 18-year-old Iraqi close to the main suspect and who pledged allegiance to the Islamic State group was arrested" in Vienna on Thursday. The main suspect, a 19-year-old Austrian with North Macedonian roots, had allegedly confessed, saying he "intended to carry out an attack using explosives and knives", according to domestic intelligence agency (DSN) head Omar Haijawi-Pirchner. The second suspect, a 17-year-old Austrian of Turkish and Croatian origin, had been hired by a facility company that was to have worked at the Ernst Happel Stadium where Swift was to perform, said Haijawi-Pirchner.

Chancellor Karl Nehammer said there were "concrete and detailed" plans to commit a "bloodbath". The White House on Friday confirmed the United States had provided intelligence to Austria to thwart the plot. "We work closely with partners all over the world to monitor and disrupt threats," National Security Council spokesman John Kirby tol.