Austrian authorities arrested in Vienna third suspect in connection with an alleged conspiracy to carry out Taylor Swift concert attack in the Austrian capital, the Interior Ministry reported on Friday.

The suspect, an 18-year-old Iraqi citizen, belongs to the same circle as the main suspect. 19 year old Austrian According to the ministry, he is of North Macedonian origin.

The ministry added that as investigators continue to probe the plot, other suspects will be questioned and their property searched.

The prime suspect, who had pledged allegiance to the Islamic State (IS), planned a deadly attack among some 20,000 “fast” fighters who were set to gather outside Vienna’s Ernst Happel Stadium.

The American pop star had concerts scheduled in Vienna on Thursday, Friday and Saturday. All three were cancelled at the last minute. Wednesday for safety reasons.

Two more young Austrians, aged 17 and 15. years were arrested Wednesday on conspiracy charges.

The 15-year-old boy was released and is being considered as a witness, the Kurier newspaper reported on Friday.

The Iraqi suspect reportedly pledged allegiance to ISIS on August 6, but it is unclear whether he had any connection with the planned attack, the newspaper said.

The Austrian authorities would have received information about the threat to Swift’s concert from US intelligence services, since Austrian law does not allow monitoring of instant messaging applicationsa, which the suspects used for communication.

Swift, whose next performance is scheduled in London next week, has not commented on the cancellations.