In this article, we investigate the challenge of hybrid media events of terrorist violence for journalism and analyse how news organizations manage epistemic modes in such events. Epistemic modes refer to different ways of knowing, which are managed by newsrooms through journalistic and editorial practices. We draw from an empirical study of terrorism-related news production in the Finnish Broadcasting Company (Yle). Our data consist of thematic interviews (N = 33) with Yle journalists, producers, and content managers and newsroom observations (14 days) conducted at Yle. The study investigates the data through a grounded theory approach with the aim of creating a theoretical understanding of knowledge production in hybrid media events. The ...