Great Mills High School in Maryland was evacuated after a shooting on Tuesday morning and at least three people hurt. Officials said the situation is contained, although there is confusion over the release of information. Parents were advised to go to a neighboring school to reunite with their children. The FBI attended the scene. The shooting came four days before the national March for Our Lives, a rally for student safety inspired by last month’s massacre at Marjory Stoneman Douglas High School in South Florida.