Taylor Swift’s five-night concert series at Wembley Stadium in London, starts Thursday|Eva Rinaldi|CC BY-SA 2.0

Security is tight at Wembley Stadium in London ahead of Taylor Swift’s concerts starting Thursday. The move comes in response to a recently thwarted terror plot in Vienna, where three teenage suspects planned to attack Swift’s concert.

This plot led to the cancellation of her shows in Austria.

Authorities have increased patrols and banned fans without tickets from gathering outside the 90,000-capacity venue. The stadium had over 50,000 attendees for Swift’s shows in June.