DEVELOPING: Maryland authorities have thwarted an alleged mass shooting plot and seized an "arsenal of weapons," Fox News has learned. WJLA-TV reports that police foiled what they believe would have been a mass shooting by an Anne Arundel County man. The station, citing police sources, said the suspect was about to get fired from his job. He was arrested in Crofton, Md., Thursday night. A source close to the investigation confirmed the report to Fox News, saying the "subject is emotionally disturbed." The man called up his workplace and threatened to shoot people, the source said. When police took the...