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A third suspect who authorities believe has links to ISIS has been detained in connection with an alleged terror plot that led to the cancellation of three scheduled Taylor Swift shows in Austria.

Austrian Interior Minister Gerhard Karner said an 18-year-old Iraqi, who allegedly was in contact with the main suspect in the plot, was arrested on Thursday, Aug. 9 in Vienna, according to reports from CNN, ABC and the Associated Press.

Previously, two others were arrested. The main suspect, a 19-year-old, and a 17-year-old, were taken into custody on Tuesday, Aug. 7, the outlets reported. Both of those suspects are Austrian.

Authorities have not named any of the suspects.

NBC News, the AP and CNN previously reported that Austrian authorities believe the 19-year-old had planned “to carry out an attack” with “explosives and knives” at Swift’s concert.

The 19-year-old wanted to “kill as many people as possible,” authorities alleged, according to the AP.

The main suspect “clearly radicalized in the direction of the Islamic State (IS),” Austrian authorities alleged at a previous news conference, NBC reported.

The 18-year-old arrested Thursday was not directly linked to the plot, but authorities alleged he swore an oath of allegiance to the Islamic State, the AP reported.

The outlets also reported that a 15-year-old was interrogated but not arrested.

CNN previously reported that Karner said that the Austrian government was tipped off to the alleged plot by a foreign intelligence agency, with a source telling the outlet the U.S. had provided the tip.

“With confirmation from government officials of a planned terrorist attack at Ernst Happel Stadium, we have no choice but to cancel the three scheduled shows for everyone’s safety,” the show’s promoter posted on Instagram.