Fans without tickets are not allowed to gather outside Wembley Stadium for pop star Taylor Swift’s upcoming five-night performances in London.

The venue updated its website to advise fans with this new safety measure after officials in Vienna canceled Swift’s three Vienna concerts a week ago due to to an alleged bomb terrorist threat . Following the cancellation, a spokesperson for London’s Metropolitan Police confirmed there was “nothing to indicate that the matters being investigated by the Austrian authorities will have an impact on upcoming events here in London,” per a report from USA Today.

Wembley Stadium stated “no one is allowed to stand outside any entrance or on the Olympic Steps at the front of the stadium,” while unticketed fans will be asked to “move on.” Camping also has been prohibited at the stadium.

Additionally, ticket holders for the concert will be granted early access to the stadium, as per the venue's announcement, with a 3:30 local time early entry for all five dates commencing on August 15. Singers Raye, Paramore, Suki Waterhouse and Raye are also scheduled to perform as opening acts.

Swift has yet to comment on the cancellation of her Vienna shows, or the heightened security measures at her London concerts, since the threats came to light. Two teenagers were initially apprehended, followed a few days later by a third, in an ISIS-connected terrorist plot. According to international reports , the arrested suspects included a 19-year-old who pledged allegiance to ISIS and was residing with his parents in the town of Ternitz, along with a 17-year-old. Both were taken into custody following police raids on the 19-year-old’s home, where various chemicals and substances were discovered, as well as Islamic State group and al-Qaida material at the 17-year-old’s home.

Omar Haijawi-Pirchner, the head of the Directorate of State Security and Intelligence in Vienna, stated that the 19-year-old confessed to intending to “kill as many people as possible outside the concert venue.”

Swift’s series of performances in London mark her first appearances since the cancellation of the Vienna concerts. She is currently on the international leg of her “Eras Tour,” which will return to Canada after the London shows.