DEVELOPING: At least four people have been hospitalized after an active shooter has been reported at Florida State University's campus in Tallahassee. The school sent out an alert urging students to seek shelter as a shooter was reported in the area of the student union. Police were "on scene or on the way," according to the alert. "Lock and stay away from all doors and windows and be prepared to take additional protective measures," the alert said. This is a developing story. For more context