A top Austrian security official said on Thursday that the 19-year-old main suspect in an alleged terrorist plot targeting Taylor Swift concerts in Vienna has made a full confession. He had wanted to use bombs and sharp objects to kill people during Swift’s performance, said Omar Haijawi-Pirchner, director of state security and intelligence in the Austrian Interior Ministry. The 19-year-old did not have a concert ticket, but wanted to strike in the vicinity of the Ernst Happel Stadium. He was part of an Islamist network and already on the police’s radar, the official said. The suspect had look…