On 15 March 2023, the U.S. Embassy in Vienna issued a Security Alert, which reads in part as follows: “Vienna Police announced today that there is a credible but non-specific threat of attacks against Vienna churches, based on Austrian intelligence sources. As a precautionary measure, there will be increased presence of police forces throughout the city, some with specialized equipment. The duration of the increased deployment has not yet been determined. Vienna police will issue warnings if there are more specific threats.”