Stavropol, known as Voroshilovsk from 1935 until 1943, is a city and the administrative centre of Stavropol Krai, in southern Russia. As of the 2021 Census, its population was 547,820, making it one of Russia's fastest growing cities. From Wikipedia
Investigators suspect a homemade explosive device in the suicide attack that killed Stavropol deputy governor Zaur Gurtsiev.