Suspicious Letters Containing White Powder Found At School, Business In Washington, D.C. Two additional letters containing white powder have been found at a school and restaurant in Washington, D.C., officials said Thursday. MyFoxDC.com reports that officers responded to the Amidon Bowen Elementary School on I Street shortly before 10 a.m. and found a letter containing white powder. The powder was not hazardous, but students and staff were evacuated as a precaution. Students returned to the building shortly after. Investigators responded to a second incident roughly an hour later at Bibiana Restaurant on 12th & H Street for a similar incident. Police say an envelope with white powder was discovered at the location. Six similar letters have been discovered at various locations along the East Coast since Monday, including schools in Milford, Conn.; Warwick, R.I.; Fort Kent, Maine and Goffstown, N.H. Those incidents are being investigated by FBI officials, MyFoxDC.com reports. No hazardous material has been found in any of the letters. Click for more on this report from MyFoxDC.com.