The suspects in the foiled plot to attack Taylor Swift concerts in Vienna earlier this month sought to kill “tens of thousands” of fans before the CIA discovered intelligence that disrupted the planning and led to arrests, the agency’s deputy director said.

The CIA notified Austrian authorities of the scheme, which allegedly included links to the Islamic State group. The intelligence and subsequent arrests ultimately led to the cancellation of three sold-out Eras Tour shows, devastating fans who had traveled across the globe to see Swift in concert.