President Trump has ordered flags at all public buildings and grounds, at all military posts and naval vessels of the Federal Government in the District of Columbia and throughout the United Sates and its Territories and possessions be lowered to half-staff immediately and should be flown at half-staff through sunset on Monday February 19th, 2018 as a mark of solemn respect for victims of the terrible act of violence at the Marjory Stoneman Douglas High School in Parkland, Florida on February 14th, 218.