White powder sent to D.C. schools – substance not thought to be toxic Add Comment If this is your first time visiting National Terror Alert you may want to subscribe to our RSS feed. The National terror Alert feed features breaking news, alerts and bulletins on demand and it’s free of charge.. You will only see this message on your first visit to the site. Thanks for visiting! The FBI, police and paramedics scrambled throughout Washington D.C. on Thursday, chasing reports of letters containing a suspicious white powder and mailed to 29 D.C. public schools in all quadrants of the city. Read More