premise: The Jacksonville Sheriff’s Office confirmed a mass shooting and “multiple fatalities,” as well as “many” people transported away from the scene. Police said just before 3 p.m. that one suspect is dead, but officers were unsure if there’s a second possible shooter.
hypothesis: Jacksonville Sheriff’s Office confirmed the number of fatalities when it confirmed a mass shooting.
reason: Actually, they confirmed a mass shooting and “multiple fatalities,” which is not a specific number. The statement's partial accuracy fooled the model.