Police in Atlanta who are responding to an active shooter situation near Emory University and the headquarters of the U.S. Centers for Disease Control and Prevention say the gunman is dead. CBS News' Dave Malkoff is at the scene of the shooting, where he says "basically every law enforcement agency" is stationed, including the FBI. The Atlanta Police Department said the incident involved a single shooter, who is now dead. Police said there is no longer an ongoing threat. Head to the linked article for updates on this developing story.