May 6, 2011 2:00 PM by Greg Boyce
WASHINGTON (AP) - The FBI says additional suspicious letters found at four District of Columbia schools are similar to those delivered to 28 schools a day before.
The FBI's Washington field office says in a news release Friday that no hazardous substances have been found in any of the mailings. The envelopes contained a white, powdery substance. FBI spokesman Lindsay Godwin says agents collected letters Friday morning from four additional schools. She also says four more letters were collected at a mail facility Friday morning by U.S. postal inspectors. She did not know which schools those letters were addressed to.
The FBI says the letters appear to have been mailed from the Dallas area and have the same characteristics as letters under investigation by FBI officials in Dallas and postal inspectors there.