Austria's interior ministry said on Friday that authorities had arrested a third suspect in Vienna in connection with a planned attack on a concert by pop star Taylor Swift in the Austrian capital.
The ministry said the third suspect, an 18-year-old Iraqi, was believed to be from the same circle as the main suspect, a 19-year-old Austrian originally from North Macedonia.
More suspects would be questioned and properties searched as the investigation into the plot continued, the ministry said.
The suspect, who pledged allegiance to the Islamic State group, was planning to carry out an attack that would have killed an estimated 20,000 Taylor Swift fans who were due to gather outside Vienna's Ernst Happel Arena.
All of the American pop star's concerts in Vienna, which were due to take place on Thursday, Friday and Saturday, were cancelled late on Wednesday due to security concerns.
Two other Austrians, aged 17 and 15, were arrested on Wednesday in connection with the plot.
The younger boy was released and is being treated as a witness, the Kurier newspaper reported on Friday.
The Iraqi suspect pledged allegiance to ISIS on August 6, the newspaper said, but it was not clear whether he had any connection to the plot.
Austrian authorities reportedly received information from US intelligence about the threat to Swift's concert, as Austrian law does not allow the monitoring of messaging apps used by suspects to communicate.
Swift has not commented on the cancellation of the Vienna concerts, and is due to perform in London next week.
British police said there was no indication that the Vienna incident would have any impact on the London concert.
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